Pro Surfer Anastasia Ashley -- Pre-Surf Warm-Up TWERK

LeBron James has his chalk toss ... Metallica's got their band huddle ... we're pretty sure Justin Bieber kisses a photo of himself -- but the greatest pre-show ritual of all time definitely belongs to pro surfer babe Anastasia Ashley.

The video was shot over the weekend at the Supergirl Pro in Oceanside, CA -- and while Ashley didn't even come close to winning the competition, she definitely won our hearts.

Sorry, Miley Cyrus. You've been replaced. Thanks to Vidhuntr for the clip.