“Sex and the City” hottie Jason Lewis was seen out with a newly single Laura Prepon, who dyed her long hair blonde from the trademark auburn color she sported on That 70s Show. Prepon is no longer with Scientologist Christopher Masterson, and Lewis was seen whispering in her ear and looking quite friendly with her at some Kentucky Derby parties:

“The pair [Jason Lewis and Laura Prepon] went to all the parties together and exchanged digits at the end of the first events,” says the source. “Although I didn’t see the two lock lips, they were very cozy and whispered into each others’ ears when they spoke.”

At the Stuff magazine/Polaroid bash, the couple was “dancing and having a great time together,” says another source. Laura better watch out! The Mr. Brooks actor was overheard saying he’s looking for a new girlfriend!

[From Star Magazine print edition, May 28, 2007]

Lewis was so cute with Rosario Dawson, and he seems like the type of guy that makes a great, loyal boyfriend. They would make such a great couple, and I hope this is true.

Prepon is in ABC series “October Road,” which was just re-upped for the new fall season.