updated 06/05/2011 AT 9:00 PM ET
•originally published 06/05/2011 AT 10:30 PM ET
Looks like Justin Timberlake and Mila Kunis are taking their roles in upcoming romantic comedy Friends With Benefits to heart.
The costars addressed rumors they were hooking up off-camera at the MTV Movie Awards Sunday with a little friendly P.D.A. – and nothing was hands-off.
So are they boyfriend and girlfriend? More like brother and sister, Kunis, 27, says.