RITA ORA Birthday Collision with ... LEWIS HAMILTON AND A POLE!

Rita Ora's 25th birthday was almost a night she'd never remember because she almost knocked herself out by smashing into a giant metal pole.

Ora was leaving a London restaurant Tuesday night after celebrating her bday with friends, including Formula One stud Lewis Hamilton. Looks like it was a verrry good night ... based on Rita's near headfirst stumble, anyway.
Friends don't let friends concuss alone. tmz