Saleem Elatab-AhmadElatab / Splash News 1 / 6
Saleem Elatab-AhmadElatab / Splash News 1 / 6

While doing some post-Christmas shopping in NYC, Pete Wentz sported a black eye.

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"The mean streets of NY got to him," his rep joked to

But a source close to the Fall Out Boy rocker, 30, tells Us he simply fell on the street and insists the bruise "is not as bad as it looks."

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He and wife Ashlee Simpson, now playing Roxie Hart in the Broadway production of Chicago, seemed to have a more peaceful holiday, spending it with Simpson's family and their 1-year-old son, Bronx, in the Big Apple.

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On Christmas Day, Wentz Twittered: "bought the lil kid sea monkeys today. if he can believe in santa, he can believe in sea monkeys."

His wife, 25, also was in the festive mood, Twittering: "merry merry christmas everyone..ahh I love christmas."

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