JT and Cam: Fakin' It

6/8/2007 12:08 PM PDT

JT and Cam: Fakin' It

Former duo Justin Timberlake and Cameron Diaz looked totally enchanted with each other today ... when cameras were on them!

The exes appeared for the "Shrek the Third" premiere on a balcony at Berlin's Palais am Festungsgraben. The twosome, who parted ways in January, look like they're ready to stab each other right through their smiles.

Über bitter!