Bumpin' and beautiful! Proud of their pregnancy curves, celebrities love to show off their bumps in bikinis. Check out our gallery of pregnant stars -- including Jamie Lynn Sigler and Kim Kardashian -- in swimsuits!
The second-time mom-to-be tweeted a photo of herself on Dec. 30, 2012, posing in front of a mirror while wearing a bikini with her bare baby bump in full view. "Bumpin' and proud!" Simpson—who welcomed son Ace Knute in June 2013—wrote as the caption.