No wonder Rachel McAdams had a huge smile on her face Monday as she headed toward her gate at LAX — she and boyfriend Michael Sheen shared a kiss that was so steamy even a security guy was checking them out! It was a huge PDA from the couple, who went public in early October with a hand-in-hand walk around Toronto. Since then, she's been busy working on her Terrence Malick film in Oklahoma and promoting Morning Glory in NYC while Michael hung out in California and celebrated Halloween with his daughter and made the award show rounds. Now he and Rachel are going into their first holiday season together, so hopefully, he knows what's on the top of her Christmas list.

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