"Happy 33rd birthday to the one and only Charli XCX! It's official, you are now a triple threat - singer, songwriter, and seasoned adult/adult-ish person. But let's be real, you'll always be a boss babe at heart. Wishing you a year filled with fantastic music, fabulous outfits, and endless dance parties. Keep slaying, Charli! 🎉👑 #33neverlookedsogood #stillayoungatheart"