Posing in front of a mirror in nothing but a lace bra and black briefs, theExtra correspondent put one hand on her belly and used the other to snap the photo.
"Update on us...Rafael is doing wonderfully!" the radiant second-time mom wrote in the accompanying caption. "He is two days old now. Such a sweet little boy. I'm feeling well, been up with him every hour to two hours."
She went on to explain the picture, which she took while still in the hospital. "I have been planning on doing post belly photos but didn't know if I was gonna have the guts to actually follow through," she admitted.
"I hope you understand my intention here: I believe it is important to accept and love our form after going through a bit of battle bringing life into this world," she continued. "Deep breath, here we go...all the way from my glamorous hospital bathroom. #ShrinkingBaldwinBabyBump #NoShame #LoveYourBody"
The photo was met with support from the fitness fanatic's followers, who praised her as "brave" for "being honest about post-baby bodies." Many also thanked her for sharing such a positive message, calling her "beautiful" and "amazing."
As previously reported, Hilaria gave birth to Rafael on June 17. He joins big sister Carmen, 21 months, and Alec's daughter Ireland Baldwin, 19, from his marriage to Kim Basinger.