But it's a pretty big departure for the pair who just recently co-starred as brother and sister in the sci-fi flick Divergent.
So what's it like for them to cuddle up onscreen so soon after playing siblings?
"It's so much fun, cause I've always wanted to make out with my brother," Woodley jokingly told E! News at the junket for Fault.
On a more serious note, Woodley, 22, admitted she was surprised Elgort, 20, got the part.