Kourtney Kardashian
The E! reality star turns 32 at Gallery nightclub in Las Vegas, where baby daddy Scott Disick was on hand to help her celebrate.
Maria Sharapova
It's a Bahamian B-day for the tennis star, as she rings in her 24th at the Atlantis resort.
Vanessa Hudgens
The newly single starlet celebrates her 22nd birthday at Pure nightclub, where girlfriends Ashley Tisdale and Brittany Snow were on hand. On the carpet, Vanessa said she and Zac Efron are "good".
Miley Cyrus
After performing at the American Music Awards, it's a party in the USA for Miley's 18th B-day. Specifically, the birthday girl celebrated at Trousdale in West Hollywood, where she got hot and heavy with a mystery man.
Ashley Tisdale
The Hellcats hottie blows out her candles at Tabu Ultra Lounge in Las Vegas, as her castmates cheered her on.
Brody Jenner
The Hills hunk turns 27 with a splash at Tao Beach, where he was joined by his brother. Girlfriend Avril Lavigne couldn't be there as she busy recording an album in Sweden.
Demi Lovato
The Disney darling turns 18 with a sparkly cake at Buddakan in NYC. But it wasn't all, "Me, me, me!" The generous actress bought her parents a house on her big day!
Mark Salling
The Glee guy was surprised with a cake to celebrate his 28th birthday while attending a French Connection party at Soho House. He also worked all day on set before partying...our kind of guy!
AnnaLynne McCord
The 90210 starlet turns 23 in style with a poolside bash at Wet Republic in Vegas, where she was joined by boyfriend Kellan Lutz.
Stella McDermott
Tori Spelling celebrates her daughter's second birthday with a little help from BornFree—glitzing out the girly event with cupcakes from Sprinkles and a lifesize Barbie cake that's taller than the birthday girl! We wouldn't expect anything less.
Scott Disick
Kourtney Kardashian is on hand to celebrate baby daddy Scott Disick's birthday in Vegas, as he blows out his candles at the Artisan Hotel.
Tony Parker
Eva Longoria Parker helps her basketballer hubby celebrate at Eve, her nightclub in Vegas. The birthday boy was feeling so festive that he gave all the partygoers a free shot!
Audrina Patridge
The reality star gets serenaded by singer boyfriend Ryan Cabrera during her birthday party at Las Palmas in Hollywood, where guests toasted with Alma tequila. Cheers!
Carmen Electra
The sexy starlet shows off her cake while celebrating at Wet Republic in Las Vegas. The birthday girl was joined by her fiancé, Rob Patterson, and toasted with Hpnotiq.
Kourtney Kardashian
The Kourtney & Khloé Take Miami star celebrates her 31st birthday at Wet Republic, where her sister Kim gave a little TMI.
America Ferrera
The Ugly Betty star blows out the candles on her cake at SL in New York City. Did she wish for a new hit series to star in?
Leona Lewis
The songbird turns 25 in Sin City, with a bash at Pure Nightclub surrounded by her family and friends. She later performed some of her hits for the partygoers.
Liam McDermott
Dean McDermott and Tori Spelling throw a superhero-themed bash for 3-year-old Liam's birthday. Little sis Stella was also on hand for the family-friendly festivities.
Paris Hilton
The heiress rings in 29 years with a huge cake and boyfriend Doug Reinhardt at Tao. She also had a birthday dinner and bash back in L.A. earlier that week.
Nina Dobrev
The Vampire Diaries star turned 21 with a dinner party at the Mondrian's Asia de Cuba restaurant. Castmates Ian Somerhalder, Kayla Ewell and Matt Lanter helped her celebrate.
John Legend
The music man, who turned 31, performed for partygoers at Haze nightclub in Vegas before blowing out the candles on his piano-shaped cake.
Kara DioGuardi
The American Idol judge blows out her candles while celebrating at Lavo in Las Vegas.
Miley Cyrus
It's her party and she'll dress skanky if she wants to! Miley turns 17 with an '80s-themed surprise party in NYC. On hand for her fete? Boyfriend Liam Hemsworth, Shannon Elizabeth and Derek Hough.
Katy Perry
The singer turned 25 with an Oompa-Loompa-themed party, where she hung with new beau Russell Brand and BFF Taylor Swift. Guests toasted the birthday day with 42 Below cocktails. Get more on Katy's bash!