The "Skyscraper" singer showed off her hot bod via Instagram on Saturday, while rocking a strapless purple bikini top and neon green bottoms.
In the candid snap, the former "X Factor" judge is holding her adorable pup (which she got over the holidays) and wearing her hair in a cute half-up-half-down 'do.
Just look at that booty!
It's been a great year for the pop star -- the 22-year-old also celebrated three years of sobriety with her beau Wilmer Valderrama earlier this month and shared a sweet snap with the "That '70s Show" alum to celebrate.
"I wish I could put into words how grateful I am for this man right here. But my love has grown to a level that words could never possibly express how much this man completes me," the pop star captioned the intimate snap.
"He's loved me the way I never thought I deserved to be loved and with this day marking my 3rd year sober... After sharing my ups, putting up with my downs and supporting my recovery... he still never takes credit and I want the world to know how incredible his soul is. I really wouldn't be alive today without him. I love you Wilmer," Demi added.
We've never seen the "Really Don't Care" singer look better!
What do you think about Demi's bikini pic? Tell toofab in the comment section below and check out the galleries above to see more celeb beach bods and some of Hollywood's hottest couples!