The twosome called it quits in mid-September, on amicable terms. "They’re professionals," an insider says of the pair. "They're still good friends and hang out on set."

Despite break-up rumors, Leighton Meester (Blair) and Sebastian Stan (Carter) were looking very much together at Monday's Costume Institute Gala Benefit at the Metropolitan Museum of Art in NYC.

Who knows if this is true, but who knows if the breakup rumors were either, so take it all with a grain of salt - but Ed Westwick and Jessica Szohr are supposedly back on!

Leighton turns 24 today!

Just when we thought Ed Westwick and Jessica Szohr's supposedly rocky relationship was back on solid ground, bintang says they've been fighting — and not in private either.

They're still together, but things are tense, a sumber says.

The Art of Elysium's 3rd Annual Black Tie Charity Gala "Heaven" in Beverly Hills Friday.

Blake Lively and Penn Badgley/ Jessica Szohr and Ed Westwick/ Leighton Meester and Sebastian Stan