Zac Efron and Matthew Morrison
08/11/2010 at 05:25 PM EDT
Details magazine cover guy Zac Efron
celebrated his new issue with a bash thrown in his honor at a private house in the Hollywood Hills – along with girlfriend Vanessa Hudgens
. The two were affectionate all night as Hudgens sat on her boyfriend's lap and ran her fingers through his hair. They were also joined by the actor's 17 Again
costar Leslie Mann
, her hubby Judd Apatow
's Matthew Morrison
, Josh Groban and other stars. Guests enjoyed passed hors d'oeuvres and watched old movies that played on flat screens around the house. When the bash wrapped around 11:30 p.m., the man of the hour invited many guests back to his place to keep the party going.
hit up L.A. nightspot MyStudio – and she wasn't just there to party. The heiress was launching Tease, her new perfume,
and she worked the crowd in a skintight white dress and Marilyn Monroe-esque blonde bob. Inside the club, Hilton was all about being the center of attention, sipping drinks and grinding against the walls, dancing and reveling in the attention – especially from guys. Also in the club: Frankie Delgado
and Adrian Grenier
Real Housewives of New Jersey
's Danielle Staub
had a party crasher as she belatedly rang in her 48th birthday at Scores strip club in N.YC. Yes, her recent frenemy Kim G.
showed up with an entourage, beating Staub to the club. When she caught wind of it, Staub stayed in her car, refusing to go inside until Kim G. was kicked out. After that was cleared up, the reality star performed her song "Real Close"
with Lori Michaels and sported some tight, pleather leggings as she enjoyed a birthday cake.
Housewife Jill Zarin
was sampling the $40 tasting menu at XIV in West Hollywood. Joining her for the meal? The Millionaire Matchmaker Patti Stanger
By JENNIFER GARCIA and CARLOS GREER