While Olive clearly loves her mama, the 4-year-old is also close with her little sister, 2-year-old Frankie.
"#mygirls #inred #internationalwomensday #whorunstheworld #girls #loveeachother #weareallsisters," Barrymore wrote alongside a cute pic of Olive giving her little sis a sweet kiss on the cheek on Wednesday.
Barrymore split with Olive and Frankie's dad, Will Kopelman, last April, but recently opened up about how the pair have remained amicable for their children.
"[My kids] know I've got them and their dad's got them and Grammy and Poppy -- I'm wearing Grammy's necklace right now -- like their cousins and [Will's sister, Jill Kargman]," she said during an interview on The Ellen DeGeneres Show. "And we do it, you know, in a way that I think a lot of other people are probably doing it too. And sometimes again, the road is different than what you try to make it or what you expected and you just figure it out, and you figure it out with grace."