With their constant travelling and long hours on the set of blockbuster movies, celebrities are often in need of a luxury space to recuperate. From Jamie Foxx's lavish studio on wheels to Marish Carey's huge motorhome, we take a look inside the most lavish RVs used by some of the world's most famous faces. Click or scroll for more...

Justin Bieber and wife Hailey, decided to get away from it all last month in an ultra-luxurious motorhome. The couple headed off to Utah for a glamping break and spared no expense with their accommodation, splashing out on an opulent Marathon Coach RV. 

This model, which is similar to the couple's design, is one of the world's most expensive RVs coming in at $2.46 million and is complete with everything they'd need to spend their time on the road in ultimate comfort. This model features an under-floor heating system, voice controls and a pop-up GPS system just to name a few. Outside, the plush accommodation has an automatic awning, which the couple were seen using during their trip around Utah.

The marble and porcelain flooring complete with lighting effects run throughout the whole interior and if the couple fancied cooking up a storm, the kitchen is perfectly equipped with an electric cooker, microwave, refrigerator with a travel lock and a dishwasher. The living space is designed for relaxing with custom-built sofas and driving would never be too taxing with massage units in the driver's seat.

Perfect for a romantic break, the bedroom, which is at the end of the RV, features a cosy king-sized bed and a built in TV unit complete with Apple TV. Should they need to take care of any laundry, there's also a washing machine hidden away in the back cupboard.

Actor Jamie Foxx purchased this huge motorhome for hosting his online talk show Off Script. The souped-up RV is where Foxx sits down with his star guests to discuss the movies they love and their cinematic influences. Stars have included the likes of Vince Vaughn and Denzel Washington. 

Inside, the motorhome by Anderson Mobile Estates is set up like a state-of-the-art studio, with a few extra luxurious additions. The décor has been kept fairly minimal with wooden floors throughout, concrete-effect walls, gold fixtures and even a record player. 

The Grey Goose bar is ideal for entertaining fellow A-listers. Fully stocked, the stunning gold and blue back-lit design is a stand-out feature of the motorhome. Flanked by a long picture window, it's the perfect space for guests to admire the jaw-dropping view over a cocktail or two. 

This luxurious blue velvet sofa is where Jamie hosts his guests and films his hit online chat show. Spotlights line the ceiling of the motorhome, while a piano sits in the corner – perfect for an all-star sing-a-long after a long day of filming.

During the filming of his movie Inception in 2009, Leonardo DiCaprio spent his time between takes in this state-of-the-art trailer. With an opulent gold-effect exterior, the 53-foot design really is a mobile mansion. The RV features extendable sides that almost double the width from eight-and-a-half feet to almost 16 feet. 

With a total interior floor plan of 720 square feet, the design of the motorhome was based on a luxury cruise ship. Designer David Rovsek was inspired by the yachts of the rich and famous, picking out features such as the cherrywood, dropped ceiling and oval overhead mirror, all home essentials for the mega-rich. 

The interior isn't short of amenities either, with two fireplaces, five TVs, including one in each of the two bathrooms, and a £20,200 ($25k) shower that's finished with glitzy glass mosaic tiles. The best bit, however, is the master bedroom, which was designed to recreate the feeling of a five-star hotel suite.

The motorhome rivals the most opulent of luxury hotels – there's even a plush carpet that slides across to extend the floor plan even further. A big consideration for an A-lister like Leo, security is taken care of thanks to cameras that link to the TVs, so you can see exactly who's at the door before answering.

Pop legend Mariah Carey spends her time on tour in this huge motorhome that's been nicknamed the 'skyscraper on wheels'. When it's parked up, the 18-wheel RV can extend out to provide nearly 1,200 square feet of living space for Mariah and her entourage. The tinted windows provide her with the ultimate in privacy, while the sleek metal exterior is nothing short of opulent.

The lower floor of the motorhome features a luxurious living space with a custom-designed 15-foot sofa and a 65-inch television. Further down the hall is the dedicated make-up area which comes complete with a chair and vanity unit. Hidden behind the mirror is the second television on the floor, so the superstar can watch her favourite shows when she's getting glammed up.

Ingeniously, the ceiling of the motorhome can be raised to create some extra headspace on the upper floor. This second-storey club space is the ultimate party house, featuring TVs at both ends, neon lighting and a dance floor – the perfect space for the star to raise the roof after a show.

For quieter evenings, the expansive trailer also features a full gourmet kitchen crafted from wood, marble and granite. The sleek space has a mini-fridge, a convection oven, stove and a top-of-the-range Kangen water filter. Not too shabby!

As retirement presents go, a top-of-the-range motorhome is up there. When professional basketball player Shaquille O'Neal retired from the Boston Celtics, they presented him with this RV. The sportsman has always been a fan of motorhomes – in 2002, he purchased a 37-foot Fleetwood Discovery, but later swapped it out for this bigger set of wheels.

The Shaq-mobile is just a small part of the star's huge property collection and features a rustic interior with a large open-plan living and dining space. The kitchen has a full-sized sink, stone countertops and a microwave, while the dining area offers luxurious leather benches with a mounted television so that Shaquille never has to miss a basketball game when he's on the road. 

Country-inspired touches abound, from the mid-tone wood panelling to the bearskin rug and cowhide cushions. When the motorhome isn't on the road, the driving cabin has a mezzanine level above it where the ex-basketball player can kick back and relax.

The master bedroom features an 85-inch king-sized bed, just long enough so that the 7′ 1″ sportsman's feet don't hang over the edge. It also had three bunk beds and two entertainment systems so Shaquille can host no end of parties in this plush pad.

When not at home with his family, media mogul Simon Cowell spends his time running his empire from this extravagant RV. The two-storey trailer comes in at 1,200 square feet and can double in size at the push of a button, stretching to 22 feet high and 14 foot wide.

A home away from home, the £1.6 million ($2m) mobile mansion features Italian leather, mirrored ceilings and three huge TVs. The main living space is home to a state-of-the-art sound system, a 20-seater cream sofa and windows fitted with custom electric shades to protect the star's privacy.

If all that wasn't enough, the dressing area also features clever covert space in the form of a mobile 24-hour doctor's office. At the press of a button, a TV pops up with video access to a medical professional, plus there's a storage cabinet with over £121,000 ($150k) of medical equipment including a stethoscope and heart monitor. 

There's also a private area at the rear for the producer to kick back and relax. The door leading to the master suite can be opaque or transparent at the touch of a remote, all for the staggering cost of around £20,200 ($25k). This zone also has a private bathroom with granite countertops and lavish cherrywood finishes. 

The mind behind hits such as 'Apologize', acclaimed music producer Timbaland purchased this plush upscale RV so that he could make music on the road. With a dramatic custom exterior in red, black and grey, the sleek six-wheeler is hard to miss. 

Located just off the driver's cabin is the comfortable wood-panelled living area. With two leather sofas, a large television, colourful strip lighting and blackout blinds, it's the perfect place for entertaining when Timbaland isn't mixing tracks.

The luxury motorhome also has air conditioning and two generators, meaning the space has full power while on the move. Four security cameras monitor the property's exterior, with footage available across multiple television screens, including one in the bathroom.

At the other end of the motorhome is Timbaland's state-of-the-art recording studio. The specially-designed space has everything he'd ever need, including soundproof doors, a two-tier keyboard and a vocal booth with a gold-plated microphone. If the star ever gets tired of work, there's also a DVD player, Xbox and PlayStation to keep him entertained. 

When filming his blockbuster movies, including the iconic Fast & Furious franchise, actor Vin Diesel likes to sit back and relax in his £890,000 ($1.1m) trailer. The huge 1,100-square-foot vehicle was custom-designed for the actor and features multiple expanding walls, two storeys and vast picture windows.

The top floor of the extravagant trailer pops up when it's stationary to reveal a media lounge, private office space and a play area for the star's children. Vin Diesel must really love his mobile mansion, as he had it shipped all the way to Puerto Rico when he was filming the latest instalment of Fast & Furious.

Downstairs, the spacious living area features wooden floors, spotlights and a swish kitchen with luxurious granite countertops. Perfect for entertaining or simply relaxing between scenes, this opulent home on wheels has every creature comfort an A-lister could need.

High-tech surveillance cameras guard over the pricey trailer – just a small part of the pricey technology packed into the RV, which amounts to a staggering £56,400 ($70k), making it the perfect billionaire bolthole. Controlled by a central smart home system, Vin Diesel has all the entertainment he needs during down-time, with a number of 3D flat-screen TVs and Blu-Ray players.

Part of his impressive property portfolio, Will Smith's custom RV, known as 'The Heat', is where he spent time while filming Men in Black III and The Pursuit of Happyness. The 1,200-square-foot mobile home rests on 22 wheels and features 14 TV screens, £24,200 ($30k) worth of leather and around £80,600 ($100k) worth of technology.

Spread over two levels, the trailer is transformed by an expanding roof, which raises the vehicle's height to over 42 inches. Upstairs there's a 30-person screening room with state-of-the-art entertainment facilities, while blackout blinds ensure the utmost privacy for the star and his family.

The glamorous main living space lies downstairs, featuring sofas aplenty and a kitchen with over £80,600 ($100k) worth of granite countertops. There's also a £20,200 ($25k) bathroom which spans the entire width of the trailer and comes complete with a steam shower and a privacy screen that turns opaque at the touch of a button.

The round dining table is perfect for socialising, with a wide picture window framing views of the set of Will's latest movie. There's also a light-up vanity mirror with a TV screen fitted behind it and a sliding doors leading to a wardrobe area where the star gets ready for filming. One thing's for sure, these opulent motorhomes aren't like any trailers we've seen before...

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