Eva Mendes -- My Week Sucks -- How's Yours Officer?

Eva Mendes has had a bad week ... first rumors she's split from the best looking guy on the planet, and now she gets stopped for talking on her cell phone ... and the most humiliating part -- by a bike cop.

Eva was tooling around L.A. -- we're guessing talking to someone about Ryan Gosling -- when a bike cop spotted her and wrote her up.

Eva's the latest victim of L.A. traffic snarl. You just can't get away anymore.

The good news ... she apparently talked her way out of the ticket, because cops tell us they have no record of a citation.