Leighton Meester: Mother's Day with 'Gossip Girl' Mom!

Leighton Meester poses for a photo with her Gossip Girl on-screen mom Margaret Colin and a mystery man after spending time together on Mother’s Day Sunday (May 12) in Hollywood.

The 27-year-old actress was also joined for the afternoon by her gal pals Aly & AJ Michalka and Davida Williams.

“Happy Mother’s Day @amandajoy78 @alyrenae @davidabwilliams #futuremomsclub,” Leighton wrote on Instagram.

“Mom and her 4 girls,” AJ wrote on Instagram along with a photo of the girls with her mom Carrie.

FYI: Leighton is wearing the Lovers + Friends Escape romper.

10+ pictures inside of Leighton Meester celebrating Mother’s Day with friends…