Troy Polamalu of the Pittsburgh Steelers recently made headlines when it was announced that his locks were insured for a whopping $1 million. The Samoan NFLer, whose hair is estimated to be three feet or so in length, has had his hair insured by Head and Shoulders, the shampoo company he’s currently endorsing. In show biz, insuring a signature body part for millions is common practice. For example, Mariah has $1 billion — that’s right, billion — insurance on her sexy gams. Find out what celebs have body parts worth more than our combined bank accounts, and what celebs need to take out an insurance policy quick…