Poor Shannon! The Real Housewives of Orange County star's estranged husband David Beador is still rubbing his rebound romance in her face — and even the couple's kids are upset, a source exclusively told Radar.

On Shannon's first Valentine's Day without her husband of 17 years, David's much-younger girlfriend Lesley Cook, 34, took to Instagram to show off their steamy date.

"Happy Valentine’s Day to the most kind, funny, motivated, loving man! The sky is more blue & my coffee tastes better with you in my life," she gushed in a caption for a photo of red balloons.

moved on so quickly and publicly, the source claimed.

Radar was the first to exclusively report that David, 53, began dating Lesley in December, only three months after Shannon, 53, announced their separation.

infamously cheated on Shannon in 2015 with a family friend.

The former couple will return to court to fight over spousal support on March 12. A mediation session to work out custody issues failed last month.

Do you think that David Beador and Lesley Cook will last? Tell us your thoughts below.

We pay for juicy info! Do you have a story for RadarOnline.com? Email us at [email protected], or call us at 800-344-9598 any time, day or night.