Cougar alert!

The ink is barely dry on The Real Housewives of Beverly Hills star Adrienne Maloof's divorce from plastic surgeon Paul Nassif, but In Touch can exclusively reveal that the 51-year old mom of three is already bouncing back with a guy nearly 20 years her junior: Sean Stewart, the son of rocker Rod Stewart.

EXCLUSIVE: Adrienne and Paul Sign Divorce Papers

The pair couldn't keep their hands off of each other during a recent dinner date at Koi in LA, says a fellow diner: “It was really full-on PDA!”

Further detailing their date in the new issue of In Touch, an eyewitness dishes: “They looked really cute and comfortable together, definitely like they’ve known each other a long time. They were sitting really close and talking in each other's ear and then ordered food to share.”

VIDEO: Now-Divorced Paul and Adrienne Share Sweet Moment
For more, pick up this week’s issue of In Touch, on newsstands now!

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