Cameron Diaz & Benji Madden Dating — Caught Locking Lips!

Cameron Diaz and Benji Madden were spotted having breakfast together at Manhattan's ABC Kitchen on June 1.

The smoochy couple confirmed their romantic relationship by locking lips.

Diaz, 41, and Madden, 35, were "whispering to each other and laughing, just having the best time together" and eyewitness said.

Diaz and Madden weren't the only ones at the table -- they were there with friends -- but the insider says the new couple seemed to be in their own world with each other.

"Throughout the entire meal, Cameron and Benji couldn't keep their hands off each other," the eyewitness revealed.