Guess the Flipper!

7/20/2007 3:20 PM PDT BY TMZ STAFF
Who is this raunchy star?

It's Robert Ritchie ... er, Kid Rock, that is! The "Cocky" musician flipped-off photogs when he arrived at Pier 59 Studios West on Thursday in L.A.

Would you expect anything less from the rocker with a song called "F**k Off"?!