We can't wait to see Justin Timberlake and Amanda Seyfried's on-screen chemistry in action!

The sexy pair showed up for the premiere of their new film, In Time, looking picture perfect together -- but JT only had eyes for on-again girlfriend Jessica Biel at the film's after-party!

The Chuck and Larry star was spotted getting cozy with the singer at the after-party, where they stole a few private moments together, according to an onlooker.

The pair reportedly hung out with a small group of friends, before re-fueling with a few food truck tacos and partying till midnight.

Sounds like these two are definitely back on!