90210 Costars Split, Still Party Together

90210 costars and onscreen couple Jessica Lowndes and Adam Gregory may have ended their real-life romance, but they’re still bumping into each other off the set.

The former couple were both partying at Apple Lounge on Saturday night with castmates AnnaLynne McCord and Tristan Wilds. But Jessica was also joined by her new actor boyfriend, Aaron Paul, making things a bit awkward for Adam.

So what went down?

“Adam tried to remain with the pack, as he did not want to be left alone with Jessica, who was getting pretty cozy with her new man in the corner of the cabana on the patio,” says a source.

The onscreen lovers began dating last year after falling for each other while filming. They celebrated Lowndes’ 20th B-day together in November with a huge masquerade party at BondSt in the Thompson Hotel. Needless to say, things subsequently cooled off.

Lowndes’ new guy, Paul, stars in this month’s horror flick The Last House on the Left.