Jessica Simpson Shares Booty Baring Bikini Pic for 37th Birthday: 'Kiss My Butt 36'

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Jessica Simpson is having a "booty-full" birthday.

The mother-of-two celebrated her 37th on Monday by catching some rays while lying out on a pool toy, and shared a bikini photo to Instagram where she left 36 behind -- literally!

WATCH: Jessica Simpson Rocks Daisy Dukes, Sky-High Heels & Cowgirl Hat to the Beach

"Kiss My Butt 36," she captioned the booty-baring snap.

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Kiss My Butt 36

A post shared by Jessica Simpson (@jessicasimpson) on

MORE: Jessica Simpson Hilariously Recalls Her Famous 'Chicken of the Sea' Moment -- Again

Looks like the perfect way to spend a birthday! In fact, the only thing that may top it is the Moana-themed party Simpson threw recently for her 4-year-old son, Ace Knute.

Watch the video below for more.

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