What happens when the biggest skateboarding legend ever meets up with Tik Tok's most prominent star?!
OLLIE LESSONS, BABY!!!
Addison Rae -- one of the most-watched Tik Tokkers on the planet -- got a surprise meeting with Tony Hawk at The Berrics skatepark in L.A. this week ... and the two got to skating immediately!
20-year-old Rae explained to 52-year-old Hawk she's just getting into the sport ... and Tony LOVED it -- and offered her a million tips on how to ride like him.
No, there were no 900s .