Barrymore ex Will Kopelman's sister created and stars in the Bravo series

On the set of Drew Barrymore‘s latest TV gig, the A-list actress is all about having fun with her family.

Barrymore guest-stars on Odd Mom Out, the bravo hit series created by her ex Will Kopelman‘s sister Jill Kargman.

Though Barrymore, 41, and Kopelman confirmed their split after almost four years together, she is still besties with her sister-in-law.

“I loved the idea of working together,” Kargman tells PEOPLE. “She surpassed all expectations, she’s a comic genius in this episode.”

Barrymore plays Meredith, an irreverent neighbor who survives a historic blizzard with Jill and Andy.

“I asked her – she read the script and loved it so I was over the moon,” says Kargman.

“It was great,” adds Kargman. “She’s such a pro and the coolest part is even though she’s dove out of planes in $100 million movies she was just as hard working on our scrappy set! The whole crew was enamored by her sweetness and blown away by her comedic chops.”

Odd Mom Out airs Mondays (10 p.m. ET) on Bravo.