Britney Spears & Robin Thicke Hooked Up While He Was With Paula Patton?!

What a bombshell!
A new rumor is floating around that Britney Spears and Robin Thicke knocked boots back in the day!
After Justin Timberlake and Brit split, she apparently had a thing with Robin. A source said:

“The pair had a fling in 2003, when Britney was at the top of her game and Robin was trying to get recognized. He was trying hard to develop a reputation as a hot, young singer, and (Britney) was the biggest thing in show business.”

The source continued on to say that they “started hooking up” while working on a project, which never got released.
What’s worse is that Robin and his wife Paula Patton have been together since high school, so this would have been in that time frame! His reps are denying that anything ever happened between the singers.
It would be super sad for Paula if this rumor turned out to be true. Also, how in the world did it stay a secret for so long?!?
[Image via WENN.]