In a stunning Instagram post on Tuesday, the 32-year-old actress sports a green top and black underwear while she breastfeeds her 1-month-old daughter, Atlas, who she shares with her boyfriend, Matte Babel.
Mitchell is all done up for the pic, in which she opted for a smokey eye and a sleek blowout as she holds Atlas, who's nude in her mom's arms.
"Breast friends forever," Mitchell captioned the shot.
ET's Katie Krause recently caught up with Mitchell at REVOLVE's 3rd Annual #REVOLVEawards 2019, and the new mom couldn't help but gush over her daughter.
"She is so incredible and growing every single day. I wouldn't trade it for the world," she said of parenting. "[What's surprised me is] just how little sleep you actually need to function, so that is what I've learned. And just to stop everything and really take it all in, because they do grow so fast. So that's what I'm trying to do."
"She has been the person I've gone to for the most advice, obviously having a daughter of her own," Mitchell said of Bellisario, who has met baby Atlas. "... I'm the luckiest person in the world. She is not only such an incredible person, but the best mom ever. And so to have her give me advice is like, more than I could ever ask for."