On Tuesday (her actual birthday), Whit and her rocker boyfriend had a low-key dinner date at STK. And last night she threw a dinner party at El Compadre, with Paris Hilton and Doug Reinhardt in attendance.
After the birthday girl blew out her candles, the group headed over to MyHouse, where they met up with still-on couple Brody Jenner and Jayde Nicole.
So how were Whit and Jay interacting without the cameras rolling for once?
They seemed "slightly awkward together, but friendly," says a source of the duo. They were dancing around their table, while Paris and Doug were engaging in some full-on PDA.
One friend MIA from the birthday bash? Lauren Conrad.
Whitney's former coworker had dinner and shot scenes for The Hills at Beso last night but never made an appearance at her friend's party.
Could L.C. still be holding a grudge against her former sidekick for scoring her own spinoff series?!