The "Gossip Girl" alum showed off her impressive post-baby bod via Instagram while promoting a new top from her Preserve site.
"Super proud of the shirt Lindsey Thornburg and I collaborated on for @preserve_us ! (Tip: open your mouth when you smile --like you're having the time of your life-- when you're, in fact, terrified you're going to break your ankle because of what an epic-ly uncoordinated person you are. I are. Am. I am ....but we're not talking about me. Of course. This is just a random tip.)," the actress captioned the candid snap.
In the photo, the blonde beauty looks picture perfect in her floral blouse and high-waisted skinny jeans.
We can't get over how tiny Blake's waist is, too -- can you believe the 27-year-old gave birth just FOUR months ago?!
Blake welcomed her first child, a baby girl named James, with hubby Ryan Reynolds in early January. Clearly, the new mom has had no problem bouncing back to her old self!
What do you think about Lively's post-baby body? Tell toofab in the comment section below and click "Launch Galley" above to see more celeb's before and after having kids!