Hugh Hefner just turned 84, but he's still the ultimate party boy.
Hef celebrated his birthday on Saturday in Las Vegas at the Palms Casino Resort with dinner at N9NE Steakhouse followed by late-night good times at the Playboy Club. Joining Hefner was girlfriend Crystal Harris, Mad Men star Bryan Batt, Jaime Pressly and hubby Simran Singh and, of course, Holly Madison.
Who else have we spotted out and about lately? How about Kim Kardashian, Renée Zellweger and one of our favorite Housewives, Kelly Bensimon…
GETTING NAILED: Renée Zellweger, getting a mani-pedi at Nail Garden in Studio City.
BOTTLE POPPIN': Gerard Butler, chatting up various ladies at Drai's in Hollywood, the same night Jesse McCartney sipped Cristal champagne at the hot spot for his 23rd birthday celebration.
JUST BEACHY: Mya, hanging out at Rock Media's Elle magazine party in Miami Beach.
RAY OF LIGHT: Real Housewives of New York City star Kelly Bensimon, checking out the clarifying light therapy at TRIA Beauty Blue Lounge in NYC.
UNDER THE RADAR: An almost unrecognizable Nikki Reed, hanging out incognito with a gal-pal at the Tea Room in Hollywood, where she rocked eyeglasses, jeans and had her hair up in a bun.
FOOLISH FUN: City gals Whitney Port and Olivia Palermo, hitting up New Year's in April: A Fool's Fete charity event in NYC, hosted by the Friends of New Yorkers for Children.
HAIRY SITUATION: Kim Kardashian, getting a laser hair removal treatment at LaserAway in West Hollywood.
MOMMY AND ME: Jessica Alba, lunching with daughter Honor at Coral Tree Café in L.A.'s Brentwood, where she generously tipped the waiter and valet.
—Additional reporting by Lindsay Miller
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Melissa Rycroft was also in Las Vegas this weekend. Find out what she was doing over at the Palazzo in today's Gossip Guru videoblog. Oh, and don't forget to follow us on Twitter @marcmalkin.