Tommy Lee & Kimberly Stewart: Going Strong!

Nov. 2 2007, Published 9:00 a.m. ET

His ex-wife just tied the knot for the third time, so could

wedding bells be far off for Tommy Lee too?

The rocker has been dating socialite Kimberly Stewart since

the summer and sources tell OK! this is way more serious than a summer fling.

"Kimberly Stewart and Tommy Lee are still going strong

and very happy together,” a source tells OK!.

While Kimberly, 28, has denied a romance with the

45-year-old Mötley Crüe drummer, their public displays of affection — which

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include smooching and cooing “baby” to each other — suggest otherwise.

“They're having a lot of fun hanging out at his house and just

kicking back," the source says.

By David Lasky