Looking to spot A-List celebrities on your summer vacation? Orbitz and OK! Magazine are excited to reveal the world's 10 most exclusive celebrity hotels* where stars like Katy Perry, Ashton Kutcher, and Justin Bieber escape for the ultimate in luxurious vacations. For those just as happy to party like rock stars, Orbitz is also sharing the inside scoop on 10 affordable, alternative hotels, each offering swanky red-carpet bang and amenities for less.

Celebrity Hotel: Hotel Gansevoort,  
(Celebrity Sightings: Katy Perry, Russell Brand, Rachel Bilson, Hayden Christensen, Shia LaBeouf)

Popular with the younger Hollywood crowd, the Hotel Gansevoort offers sleek and stylish accommodations. It features a fabulous indoor/outdoor, 260 degree rooftop bar perfect for summer celebrating.

Alternative Hotel: Ace Hotel New York,  

Located in the heart of Manhattan with an atmosphere all its own, this unique property offers stylish digs at a lower price. The hopping lobby and bar is also home to fun D-List celebrities on Fridays and Saturdays.

Celebrity Hotel: Capella Pedregal,  
(Celebrity Sightings: Zoe Saldana, Jessica Biel)

A posh cliffside resort set on 24 acres, this 5-star hotel features private terraces and plunge pools in every suite. Celebs love Auriga, Capella Pedregal's 12,000 square-foot spa.

Alternative Hotel: ME by Melia,  

Private poolside cabanas and the world-famous Nikki beach set this hotel apart from the rest. ME by Melia faces the famous Land's End rock formation, providing the perfect landscape for a luxurious vacation.

Celebrity Hotel: Fontainebleau Miami Beach,  
(Celebrity Sightings: Kate Hudson, Marissa Miller)

Newly renovated, this glamorous hot spot features 11 restaurants, 4 bars and clubs including celeb favorite LIV and a 40,000-square-foot spa. Tech-savvy travelers will love the in-room computers and modern styling.

Alternative Hotel: Doubletree Surfcomber Hotel South Beach,

This trendy ocean front art deco hotel features a heated pool overlooking the ocean. Enjoy cocktails with locals at one of the most popular Miami hot spots, Collins Bar.

Celebrity Hotel: The Peninsula Chicago,  
(Celebrity Sightings: Angelina Jolie, Johnny Depp)

Located in the heart of the Magnificent Mile this 5-star property is a perennial celebrity favorite. Features posh suites and an exclusive roof-top patio with views of the city.

Alternative Hotel: Dana Hotel & Spa,  

Personalized service and modern technology create a luxurious experience at this budget-friendly hotel. Floor-to-ceiling windows provide in-room views of the city.

Celebrity Hotel: The Cove Atlantis,  
(Celebrity Sightings: Carrie Underwood, Justin Bieber)

Celebrities flock to this chic adult-friendly, all-suite resort at Atlantis, Paradise Island. Rub elbows in the lobby designed by Jeffrey Beers before you dine at the Cove's gourmet restaurants.

Alternative Hotel: Atlantis Beach Tower,  

Stay in the heart of the mythical water city and enjoy access to Atlantis' Aquaventure, The Dig, and Dolphin Cay from this more affordable hotel.

Celebrity Hotel: Caesars Palace,  
(Celebrity Sightings: Kristin Cavallari, Holly Madison, Kardashian sisters)

A landmark resort on the Las Vegas strip, Caesar's Palace is home to the world-famous casino, private pool side cabanas and fashionable shopping at The Forum.

Alternative Hotel: MGM Grand,  

Smack dab on the Vegas Strip, the MGM offers the biggest casino in town, seven award-winning restaurants, and a huge concert venue featuring the biggest stars.

Celebrity Hotel: Four Seasons Costa Rica,  
(Celebrity Sightings: Andy Roddick, Brooklyn Decker)

A hillside retreat on Costa Rica's north Pacific coast, the Four Seasons offers everything from surfing to massage lessons, all in the luxurious style for which the name is known. Great for honeymooners and beach lovers alike.

Alternative Hotel: JW Marriott Guanacaste Resort & Spa,  

This stunning oceanfront resort is fast becoming recognized as one of the most magnificent in Latin America. Located on the country's northwestern coast, Guanacaste offers the comforts and luxuries of a Marriott in an environment that is authentically Costa Rican.

Celebrity Hotel: Andaz West Hollywood,  
(Celebrity Sightings: Anna Kendrick, Demi Moore, Ashton Kutcher)

This popular West Hollywood hotel features rooms with panoramic views of the Sunset Strip and a relaxed LA vibe. Celebrities love the rooftop pool of this centrally located hotel as well as the restaurant, RH, which has been home to Oscar celebrations.

Alternative Hotel: Le Montrose Suite Hotel,  

With suites featuring fireplaces and sunken living rooms, Le Montrose provides an intimate experience that extends to a rooftop pool deck with an amazing view of Hollywood.

Celebrity Hotel: The Stafford London,  
(Celebrity Sightings: Prince William, Kate Middleton)

This timeless and traditional London hotel tucked behind Green Park is just a few steps from Piccadilly, Bond Street and Buckingham Palace. With antique furnishing and lavish elegance this celeb favorite has a touch of old Hollywood glamour.

Alternative Hotel: The Hempel,  

The signature hotel of famous British designer Anouska Hempel, this 5-star hotel features minimalist white interior and ultra modern accessories. Enjoy the unique open-air Zen garden for cocktails or to simply lounge in the sun on beanbags. Visit No.35, a London hot spot restaurant with an exquisite menu and sophisticated cocktails.

Celebrity Hotel: Turtle Bay Resort,  
(Celebrity Sightings: The cast of "Lost," Lauren Conrad)

With almost five miles of beachfront, Turtle Bay was the ideal location for filming the hit TV series, "Lost." Add two lush pools and natural unspoiled beauty, and it's no surprise why this famous resort is popular among young Hollywood.

Alternative Hotel: Hawaii Prince Hotel Waikiki,  

All suites are oceanfront in this world-class resort featuring a five story cascading fountain. With easy access to popular attractions, guests can venture from the ocean to any number of fun offsite excursions, including shopping and dining.

To read about the hottest celebrity getaways, visit www.okmagazine.com.

*Celebrity hotels were selected based on the research and opinions of OK! Magazine editors. Alternative hotels were selected by Orbitz' staff of hotel experts and travel editors and are based on the research and opinions of these experts and writers.

**Prices based on the average daily rate for bookings between June 1 and September 6, 2010.