Kiss My Butt 36

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She's like a fine wine!

Jessica Simpson turned 37-years-old on Monday, and she marked the big day by posing topless on a pool float. "Kiss my butt 36," she captioned the photo on Instagram. It feels like just yesterday she was getting mocked for wearing mom jeans at the chili cook off!

The ditzy blonde has gotten older and wiser, and has learned how to poke fun at herself. Case in point? She posted an article titled "Whole Foods Discovered Its Chicken Salad Actually Had Tuna" on social media, and made reference to her famous comment on Newlyweds. "It happens to the best of us @wholefoods," she wrote.

She's got a lot to be thankful for as she celebrates her b-day. A hugely lucrative fashion empire. Check! A hot husband. Check! Two adorable kids. Check! Not dating John Mayer anymore. Check!