It was PDA before TSA for Rachel McAdams today -- when she was caught locking lips with boyfriend Michael Sheen at the airport!

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The couple, who met while filming "Midnight in Paris," were spotted giving each other a goodbye kiss before Rachel's flight at LAX.

Before hooking up with Sheen in the fall, McAdams was previously linked to her co-star from "The Notebook," Ryan Gosling.

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