CHELSEA HANDLER lets it ALL hang out on the ski slopes for her 45th!

Chelsea Handler is repping some serious 45th birthday #GOALS in Colorado this week! The comedian has been posting on Instagram to celebrate with her bare butt out as she skis down a mountain while ALSO smoking and sipping from a cocktail glass.

And if that wasn’t enough, she also posted a video of herself taking a “bong” hit from a birthday cupcake.

This funny lady sure knows how to party!