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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… More Here! »

Leighton Meester keeps it casual while shooting scenes on the set of her new film Life Partners on Sunday (May 5) in Los Angeles.

Later in the day, the 27-year-old actress, who plays a lesbian in the film, was seen rocking a yellow beanie while walking on set.

PHOTOS: Check out the latest pics of Leighton Meester

Leighton was also joined on set by her co-star Gillian Jacobs, who was spotted chatting on the phone.

It was recently announced that Leighton‘s boyfriend Adam Brody will play Gillian‘s love interest in the film. More Here! »

Leighton Meester and Adam Brody are set to star on the big screen together for the second time in the upcoming comedy Life Partners!

The 27-year-old actress and the 33-year-old actor previously worked together on the film The Oranges and they have since become a real-life couple.

Leighton and Adam will star alongside Community‘s Gillian Jacobs, Gabourey Sidibe, and SNL‘s Abby Elliott, according to Deadline.

The comedy follows “a codependent friendship between two very different girls — type-A Paige (Jacobs) and lesbian slacker Sasha (Meester). Paige has vowed that she won’t get married until Sasha has the same legal right and that works out fine until Paige meets Tim (Brody), a young and charming doctor. As a crucial vote on gay marriage approaches, the threesome struggle with issues of love, friendship, and loyalty.”

WHAT DO YOU THINK of Leighton Meester and Adam Brody’s new project?

Leighton Meester and Adam Brody keep low profiles as they leave the ArcLight Cinemas together on Saturday (April 27) in Los Angeles.

The 27-year-old Gossip Girl actress and her 33-year-old actor/rumored new boyfriend were joined by a group of pals for their evening outing.

PHOTOS: Check out the latest pics of Leighton Meester

Leighton just recently celebrated her 27th birthday earlier this month – happy belated birthday, Leighton!

Adam and Leighton were last spotted out and about together last month, driving around town after reportedly spending the evening together.

FYI: Leighton is wearing Heartloom’s Abril top and Zadig & Voltaire’s Milla Cobra Deluxe bag.

Leighton Meester shows off her physique while exiting a yoga class on Friday (March 22) in Los Angeles.

Earlier in the week, the 26-year-old actress posted on her Facebook, “The only person pressuring me is myself.”

PHOTOS: Check out the latest pics of Leighton Meester

Last weekend, Leighton was spotted riding shotgun in her beau Adam Brody‘s car in Beverly Hills.

Leighton is currently filming her new flick God Only Knows, also starring Ben Barnes.

10+ pictures inside of Leighton Meester keeping herself in shape with a yoga session… More Here! »

Leighton Meester and Adam Brody depart her home after reportedly spending the night together on Saturday morning (March 16) in Beverly Hills, Calif.

Later in the day, the 26-year-old actress went to a nail salon and grabbed iced coffee with a gal pal.

PHOTOS: Check out the latest pics of Leighton Meester

The rumored new couple was spotted going on separate lunch outings earlier in the week.

Adam, 33, is currently guest starring on Showtime’s House of Lies so make sure to check out his episodes!

20+ pictures inside of Leighton Meester and Adam Brody in the car together… More Here! »

Leighton Meester carries her niece after having lunch with some family members on Thursday (March 14) in Los Angeles.

Later in the day, the 26-year-old actress’ rumored new boyfriend Adam Brody was red hot while grabbing a salad in Studio City.

PHOTOS: Check out the latest pics of Leighton Meester

Over the weekend, Leighton kept herself in shape while stopping by for a yoga session in Hollywood.

Also pictured: Adam attending the Some Girl(s) red carpet arrivals at the 2013 SXSW Film Festival held at the Topfer Theatre at ZACH on Saturday (March 9) in Austin, Texas.

25+ pictures inside of Leighton Meester spending time with family… More Here! »