Justin Timberlake and Mila Kunis aren't the only ones getting hot and heavy.
OFF screen, Penn Badgley and Zoe Kravitz may be trying out some of the techniques they saw in the summer flick.
At the Friends With Benefits premiere party, the two were seen flirting heavily with each other.
When they left together around 1:30am, Penn gave Lenny Kravitz's daughter a slap on the butt!
Nothing's for certain, but if that doesn't say, 'hell yeah, we're about to have sex,' we don't know what does!
[Image via Dan Jackman/Mr Blue/WENN.]
Tags: flirting, friends with benefits, hot, premiere party, sex