Reese Witherspoon sunglasses blonde hoody mustache work out

Reese Witherspoon has a great sense of humor!

The Oscar-winning actress, who gave birth to son Tennessee last September, left her morning workout sporting a mustache t-shirt. Adorbs!

We love that the 36-year-old mama of three doesn't mind showing her pretty face even without makeup.

Who can resist that A-list smile? What a beauty!