Simone Biles finds Olympian nearly twice her size

— -- The Olympics opening ceremony isn't until Friday, but it looks like Simone Biles is already having a great time in Rio.

She posted some fun pictures via Twitter on Tuesday, including this one of her and David Lee, a member of the U.S. men's volleyball team who's got a couple of inches on her -- well, more like 24 inches.

Biles also posted this cool shot with her gymnastic teammates.

Biles & Co. begin competing Sunday.