Mick Jagger -- Gimme Shelter from Katy Perry's Lies, I Never Hit On Her

Mick Jagger pulled the lamest rock-n-roll move ever today ... denying he flirted with a young, hot chick named Katy Perry.

In case you missed it ... Perry told an Australian radio show this week she had dinner with Mick when she was 18 -- and singing back-up for his solo project -- and claims the rock legend hit on her.

But today the 70-year old singer actually took the time to release a statement saying he "categorically denies" making a pass at Katy ... adding, "perhaps she is confusing him with someone else."

First he accepted Knighthood from the Queen, now ... he's officially denying hitting on women?