CAMERON DIAZ - CAMERON DIAZ UPSET OVER JARED + BRITNEY

Movie beauty CAMERON DIAZ was so devastated at learning of ex-beau JARED LETO's alleged fling with pop babe BRITNEY SPEARS, she broke down in tears.

The CHARLIE'S ANGELS actress - who's currently in the midst of a highly-publicised relationship with music hunk JUSTIN TIMBERLAKE - felt betrayed by her former lover's romance, according to Britain's NEW magazine.

But Justin was unaffected by the news - he was convinced his OOPS!...I DID IT AGAIN ex used Leto to get back at him.

A source says, "Cameron was heartbroken when she found out Jared was dating Britney. It upset her so much she broke down in tears.

"She couldn't help feeling betrayed by Jared even though they were no longer a couple.

"Justin just laughed the whole thing off. He thinks Britney is just trying to get back at him."