"Happy 50th birthday to my big Bro John!!" she wrote in the caption of the post. "Thank you for teaching me how to change a flat tire, skip rocks on the lake, build a fort in the backyard and ...

Will Smith with brother Harry on Sept. 4, 2008. Gregg DeGuire/WireImage "Its #cincodemayo y’all! Celebrating #life cause its more than just amazing!!