'Biggest Loser' Contestant Sued After Allegedly Gaining 'Far Too Much Weight'

"Biggest Loser" alum Tara Costa could have a weighty legal situation on her hands.

Costa, who appeared on NBC's "The Biggest Loser: Couples 2"  -- and lost 155 pounds in the process -- is being sued by a fitness company, which claims that Costa violated a business agreement with them.

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