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.

The power of Ryan Gosling.

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