Paris Hilton’s Vegas set twenty-sixth birthday party was shunned in favor of chilling in New York for Untitled Entertainment founder Jason Weinberg’s 40th birthday at the Midtown hot spot The Grand on Friday night.

J.W toasted his big day with members of the A-list like Clive Davis, Kanye West, Marissa Tomei, Amy Sacco and Naomi Watts. Jason even had his “Happy Birthday” sung to him by Blondie singer Debbie Harry.

Herpes Hilton held her party at Body English at the Hard Rock Hotel & Casino in Vegas. And the bash turned out to be more of a bust.

“There were no names there except for [sister] Nicky Hilton and Nicole Richie,” says a snitching source.

After downing TY KU liquor and bottles of Dom Perignon, guests reported seeing Hilton play with a monkey while a band of midgets led a pack of goats around the room.