Justin Bieber's feeling better - in fact, he's feeling good enough to FIGHT ... 'cause he just went after a photog in London ... and screamed, "I'LL F**KING BEAT THE F**K OUT OF YOU."
"The fuck did you say?"
Damn. He came right out though. Gotta give him props for that. Since he was saying fuck he didn't care if the camera was on him or not. Gotta give little biebs some props.