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Given Britney Spears' recent predilection for unleashing her manicured tootsies in some of Southern California's finest public restrooms, we can't guarantee that this is just a hickey and not a fungal infection like ringworm. Until he brings his fiancée to a physician to confirm it's merely the innocent byproduct of some harmless (though rather immature) necking instead of a more sinister malady, Mr. Federline should probably keep the Cheetos bag clear of the blemish.

[Photo: Rex Features]