12/11/2010 05:12 am ET Updated May 25, 2011

Crystal Bowersox Marries Brian Walker

They had a whirlwind courtship and an engagement lasting only weeks, but Crystal Bowersox and Brian Walker were hardly strangers in love.

Longtime friends before things turned romantic in recent months, the American Idol runner-up was married to musician Walker in Chicago on Sunday, her rep tells PEOPLE exclusively.

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