By Kat Giantis
Special to MSN Entertainment

Breakup: Justin Timberlake & Cameron Diaz
Hookup: Justin Timberlake & Jessica Biel

Justin Timberlake and Cameron Diaz kicked off 2007 by announcing they were calling it quits after nearly four years of togetherness, explaining they were doing so "mutually and as friends, with continued love and respect for one another." Nice thought, but things didn't quite work out so amicably. Days later, the former flames had a major blowup at a post-Golden Globes bash after Diaz apparently took issue with Timberlake chatting up Jessica Biel. The spat is said to have ended with the crooner punching a cabinet. Justin and Jessica were soon christened an item, and by May they were turning up together at various stops along his European tour (that same month, Timberlake and Diaz shared a friendly kiss for the cameras at the Los Angeles premiere of "Shrek 3"). And although Cameron has been all smiles since the bust-up, the same can't be said for Jessica. It seems the hard-bodied brunette, like her leggy predecessor, promptly adopted Timberlake's antipaparazzi stance, with shutterbugs frequently capturing her flashing them the stink eye. (James Devaney/WireImage.com & Stefan Soderstrom/SCANPIX/Retna Ltd.)