Heather Mills, the notorious ex of Beatle Paul McCartney, is quite single and apparently quite ready to mingle.

She showed up to the Mercedes-Benz Polo Challenge at Blue Star Jets Field in New York’s Hamptons on August 8 with a cute, shorter haircut and two girlfriends to scope out the scene.

As soon as the 41-year-old divorcee and her crew spotted the strikingly handsome (and much younger – he’s only 28!) Tim George, Jr., a rookie driver in the ARCA stock car series, Heather went right over to him, a snitch tells FOX411.

“Now that Paul has moved on with his girlfriend, Nancy Shevall, Heather thinks it’s about time she moves on, too,” says the source. “She was so into Tim, chatting with him, smiling ear to ear and hanging on his every word. They posed for photos together and kind of watched the match, but they were busy talking up a storm.”

Apparently, the two didn’t get to finish their conversation.

They met up again later that night at the Social Life Magazine party for the mag’s August issue, which features Tim on the cover.

“Heather was definitely into Tim, and it seemed he was into her, too, from how easily their conversation seemed to flow,” the insider tells FOX411. “They were inseparable!”

Interestingly, while Heather pursued her boy toy, ex Paul was only a short car ride away at the Blue Parrot in East Hampton having dinner with friends.

Listen, do you want to know a secret, do you promise not to tell….

(That’s from a Beatles song.)