Molly Sims just had a baby last June, but you'd never guess it judging from the photos the former model and television personality posted on her Twitter page. The 39-year-old got some R&R over the weekend with pals while lounging in a resort at Playa del Carmen, Mexico, and showed off her supremely fit body to boot.

Sims claimed she gained 50 pounds during her pregnancy and talked openly about her struggle to get fit afterward. "Everyone talks about the pregnancy — and don’t get me wrong, it sucks, it’s hard, you get huge — but let me tell you something, no one talks about after. That’s the hard part,” she said. “Even when you’re nauseous and even when you want to throw up and you weigh 50 lbs. from when you started, each month tells you what you need to work on.”

Also on HuffPost:

Loading Slideshow...
  • Malin Akerman

  • Jennifer Nettles

  • Claire Danes

    (Getty)

  • Snooki

    (Getty, Us Weekly)

  • Megan Fox

    (AKM-GSI ,x17)

  • Reese Witherspoon

    (Getty, FameFlynet)

  • Kourtney Kardashian

    (Us Weekly)

  • Hilary Duff

    (Getty, FameFlynet)

  • Beyonce

    Getty

  • Jenna Fischer

    Getty

  • Jane Krakowski

    Getty

  • Tori Spelling

    Getty

  • Natalie Portman

    Getty

  • Pink

    Getty

  • Victoria Beckham

    Getty

  • Rachel Zoe

    Getty

  • Kate Hudson

    Getty

  • Jessica Alba

    Getty

  • Mariah Carey

    Getty

  • Alicia Silverstone

    Getty

  • Alyssa Milano

    Getty

  • Miranda Kerr

    Getty

  • Emily Deschanel

    Getty

  • Penelope Cruz

    Getty

  • January Jones

    Getty