Best Birthday Bashes

After a busy few weeks, during which she performed at Madonna's Gucci benefit and In Style's Salute to Grammy Fashion, Rihanna took some well-deserved R&R at a surprise birthday party thrown in her honor. Fellow musician Kanye West even showed up to offer his best wishes at the bash, held at Hollywood hot spot Les Deux.

Minnie Mouse was the first to welcome tween queen Miley Cyrus (in Kaufman Franco) to the Hannah Montana star's 16th birthday celebration at Disneyland in Anaheim, California. Famous friends like Tyra Banks, Jennifer Love Hewitt and Steve Carell shared in the fun, which included a parade, fireworks and a special performance by the birthday girl.

Ed Westwick

took a break from filming Gossip Girl in the Hamptons to celebrate his 21st birthday in-where else?-Sin City. "Apparently you sweat more when you turn 21," said an overheated Westwick when he arrived for his celebration at TAO Las Vegas inside the Venetian Hotel.

After two separate celebrations-one with her family and the other with pals like Sir Elton John- Victoria Beckham made quite an entrance into Santa Monica eatery Via Veneto to mark her 34th with famous friends Katie Holmes and Tom Cruise.

Just hours after completing her first triathalon in California, Jennifer Lopez threw a surprise birthday party for husband Marc Anthony at the Bowery Hotel in New York City. "I told him it was such a busy weekend, that I might not be able to do anything," said Lopez, who arrived at the Cuban-themed bash looking as glamorous as ever.

Mary J. Blige

was among the well-wishers who helped Sean Combs celebrate his 39th birthday at New York City hot spot Mansion. Jay-Z, Rebecca Gayheart and Cassie were also on hand to help Diddy mark the big day.

In March, Fergie (in Dolce & Gabbana) hit the Beatles Revolution Lounge at the Mirage Hotel & Casino to blow out the candles on her cake, take in Love-the Cirque du Soleil show inspired by the music of the Beatles-and party into the wee hours at Jet nightclub. The pretty Pea shared her bash with Quentin Tarantino, who was in Sin City to mark his 45th birthday.

After hosting friends for a private birthday celebration at her newly opened L.A. eatery Beso, Eva Longoria Parker continued the party in Miami, where she dove into a seven layer chocolate cake at DeVito's restaurant-owned by actor Danny DeVito-in South Beach.

Jessica Simpson

kept boyfriend Tony Romo close as she celebrated her 28th birthday at the Sagebrush Cantina in Calabasas, California. Simpson's sister Ashlee and brother-in-law Pete Wentz were also on hand for the revelry.