Justin & Cameron: Back Together?

Are Justin Timberlake and Cameron Diaz getting back together?

After nearly four years together and then breaking up in January, Justin, 26, and Cameron, 34, certainly looked cozy around one another on the green carpet at the L.A. premiere of Shrek the Third on Sunday afternoon.

A peck on the cheek today… back together tomorrow!

Sidenote: It must have been a hot day in L.A.! Poor Cam, her sweaty pits are all soaking through her dress…

More pictures inside of Antonio Banderes, Melanie Griffith, Mike Meyers, Eddie Murphy, Amy Sedaris and Cheri Oteri…