"My boobs are pretty huge and awesome," she also recently joked to Us Weekly about the biggest perk to her post-baby body. "That's probably the most thing significant change [about being a mom]."
But all jokes aside, Blake is looking undeniably great these days.
Check her out looking fashionable in a waist-hugging purple peplum skirt with her older sister, Teen Witch star Robyn Lively, on Wednesday, and Blake showing off her already back-to-flat stomach in a crop top with her mother Elaine on Monday.
Blake is currently promoting her new film, The Age of Adaline, a story about a woman who, after surviving a car accident, becomes ageless. The former Gossip Girl star says that although the premise pretty much sounds like everyone's dream come true, it's actually "tragic."
"People are obsessed with beauty and youth and with looking and feeling young forever," she tells Allure. "But look at a woman who is granted that: She's trapped, because it's tragic to be young forever. And also, having a child makes you realize that we pass on for a reason. You think, 'I have to go, because it makes room for you.'"
Blake remains private about her first child with husband Ryan Reynolds, but is obviously proud of how long she was able to keep her pregnancy a secret (for seven months) and the "elegant" way they made it public.
"That was my way of owning that moment," she says about the picture she posted on her Preserve site of her cradling her obviously pregnant belly. "I can't be someone like Beyoncé and be like -- [referencing Beyoncé's onstage announcement of her pregnancy at the 2011 VMAs]. But it was important for us. It was a struggle, because we want to keep our privacy, but we also don't want our lives to be exploited by other people. So we did it simply; it was a quiet way, an elegant way."