Now that she’s agreed to become the “face” of Gillette’s “Legs of a Goddess” campaign, Mariah Carey has had her legs insured for $1 billion. That’s gotta be a record. Other celebrity legs with policies have been Fred Astaire’s ($75,000), Heidi Klum’s (left, $1.2 million; right, $1 million), Betty Grable’s ($1 million), Angie Dickinson’s ($1 million), and Mary Hart’s ($1 million). Carey will be showing off her newly respectable stems later today at a press conference Radio City Music Hall, where a 16-foot-high statue of the diva will be unveiled.