Justin Timberlake and Jessica Biel attend premiere of his movie together

Separated since March, Justin and Jessica seem to want to give their love another chance.

According to a witness at the premiere after-party of Timberlake’s new movie, In Time, in Los Angeles Thursday, the two enjoyed each other’s company.

While they didn’t stay together the entire time, Timberlake, 30, and Biel , 29, did stay at the party past midnight , after most of the other guests had left.

“[They] became more and more affectionate, sneaking kisses, whispering to each other, and sharing quick back rubs and caresses,” the onlooker said.

“At one point, she pretended to punch him a couple times and he gamely bounced up and down like a jack in the box.”

Timberlake’s movie opens Oct. 28 and also stars Olivia Wilde and Amanda Seyfried.