Angelina Jolie's Special Lapdance for Olivier Martinez

After the premiere, Angelina Jolie hit the town for fun sans lover Brad Pitt.

After an official bash at Hotel Gansevoort – where the star drank wine and, a source tells Us, was “really outgoing and very chatty� – Jolie headed to a small VIP afterparty at nearby eatery Gin Lane.

Among the guests: actor Olivier Martinez with whom she reportedly had a fling.

Encouraged by a group of drummers, the actress began dancing for Martinez.

“She turned to him on the banquette and was shaking it in front of him. She was giving him a lap dance, � another reveler tells Us. “She was looking over her shoulder, tossing a glance his way.�

As another partygoer describes it, “It was very, very flirty.�

“When she is with someone she knows, she might appear to be flirtatious, but it’s just affection.�

Last week, life & Style reported that Brad Pitt and Angelina Jolie were fighting non-stop. Brad reportedly phoned ex-wife Jennifer Aniston on April 10, intending to pour his heart out about his problems with Angelina Jolie - and ended up revealing his true feelings for Jennifer Aniston!

“Brad told Jen that he missed being with a woman who was his best friend,� the insider says. In fact, he became so emotional, he blurted a shocking confession to Jen: “I think I made a huge mistake leaving you.� Reps for Brad and Jen deny the story, but the insider insists, “There’s no doubt Brad would love to have Jen back.�