Valerie Bertinelli, then: bubbly sitcom star and America's Sweetheart turned tabloid headline and rock star wife. Now: actress, single working mother of teenage rock star, and weight-loss inspiration to millions. We all knew and loved Valerie Bertinelli years ago when she played girl-next-door cutie Barbara Cooper in the hit TV show "One Day at a Time," and then starred in numerous TV movies. From wholesome primetime in America's living rooms, Valerie moved to late nights with the hardest-partying band of the decadent eighties when she became, at twenty, wife to rock guitarist Eddie Van Halen. Losing It is Valerie's frank account of her life backstage and in the spotlight. Here are the ups and downs of teen stardom, of her complicated marriage to a brilliant, tormented musical genius, and of her very public struggle with her weight.