Chloe Kim is trading her Red, White and Blue for Orange and Brown -- the Team USA gold medalist cheered on her boyfriend, Myles Garrett, in Cleveland on Sunday ... rocking team merch on the sidelines ahead of the big win!!
The Olympic snowboarder was all smiles way before the Browns easily handled the Miami Dolphins in a 31-6 result ... and while she didn't have on a No. 95 jersey, it's no secret who she was there to see.