Thursday

Caught in the Act!

Thursday May 20, 2010 06:00 AM EDT

Mark Ballas and Derek Hough

Michael Bezjian/WireImage

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• With Dancing with the Stars down to three finalists, many of the castmembers cut loose at newly-opened H Lounge in West Hollywood – and they had good reason to party. The group celebrated the birthdays of pros Derek Hough (he turned 25 May 17) and Mark Ballas (who turns 24 on May 24). Ballas hung out in a VIP section and cozied up to the Pussycat Dolls's Ashley Roberts, while Hough was in and out after 20 minutes – just enough time to enjoy the chocolate Cold Stone Creamery birthday cake. Though he was flirting with Roberts, Ballas also played gracious host, making sure that all the guests were having fun.

• Revelers at the DWTS birthday bash included Erin Andrews and Maksim Chmerkovskiy, who joined forces by the end of the night. Andrews spent the earlier part of the evening sipping cocktails and hanging out at Cheryl Burke's table before meeting up with her dance pro pal. Evan Lysacek was also enjoying Burke's company, and the two looked like good friends, an onlooker says.

• At L.A.'s Trousdale Lounge, newly single Ryan Cabrera sure was acting like it. The singer held hands with a brunette, and the two whispered and laughed at their table. Cabrera was also dancing with her in between cocktails and conversation with friends like Christopher Mintz-Plasse.

• Orlando Bloom had an adorable pal during his late lunch at L.A.'s O!burger: girlfriend Miranda Kerr's Yorkshire Terrier, Frankie. The actor ordered a grass-fed burger and side salad during his friendly meal with pals.

• 30 Rock's Katrina Bowden enjoyed a weekend getaway in Atlantic City, spending a relaxing afternoon at the Qua spa before spending her night partying with friends at Dusk inside Caesars Atlantic City.

• By JENNIFER GARCIA, ABBY STERN and ULRICA WIHLBORG

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