6. Lindsey Vonn
In 2012, skiing star and now love interest to golf star Tiger Woods, Lindsey Vonn and her then estranged husband owed a hefty $1,705,437 in back taxes stemming back to 2010, which was the year Vonn took the Gold Medal for downhill in the Vancouver Olympics. Vonn seemed surprised when she learned about the enormous debt, and blamed the whole thing on her estranged husband.