Ryan Sheckler -- Shows Off Bronze Medal ... And Super Hot Girlfriend

Sometimes you win ... sometimes you lose ... and sometimes your girlfriend is so hot that it doesn't matter.

Extreme sports star Ryan Sheckler definitely falls into the third category ... 'cause while he came in 3rd at the X Games, TMZ Sports has photographic proof that he's dating a gold medal hottie.

Here's Sheckler showing off his bronze hardware from the Street Skate competition -- posing next to smokin' hot model Mia Bonde.

The two have been all over each others Instagrams lately ... posting not only pictures together but special cutesy messages to one another to let the world know they are officially an item.

Check out Mia below ... and regret the fact you never picked up a skateboard.