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

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

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.