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Kim K remains cool under pressure!

The reality star landed in LAX on Thursday amidst rumors she’s been cheating on new fiancé, Kris Humphries, with NFL player Bret Lockett.

A celebrity news mag is threatening to print a story with the headline: ‘Stop the Wedding! Kim Caught Cheating!’. The magazine claims they have proof Miss K cheated on her soon-to-be hubby with the NFL player.

Despite Kim threatening legal action, and claiming the story is 100% false, they aren't backing down from running the cover feature. Lockett is also backing up the claim he's had a fling with Kardashian.

Good thing Kim and Kris just signed a prenup!