Forget the Super Bowl!

Model Bella Hadid spent her Sunday poolside, and it was a cheeky bikini photo that caught most fans' attentions.

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The 19-year-old showed off her butt on Instagram in a Brazilian-style swimsuit while joking around with pal Jesse Jo Stark. It also looks like the brunette beauty made a playful grab for her friend's boob in the candid photo.

Though Bella kept her face turned away from the camera, she shared another pic later in the day of her super slim figure.

Sounds like the perfect way to spend a weekend! Scroll down to see more celebs who've posted images of their derrières on social media.