Pop singer Mariah Carey is slowing down her fitness regime after a friend warned her she was in danger of losing her curvy bottom. The WE BELONG TOGETHER star has been on a strict exercise and diet regime to get in shape after gaining weight - but now the famous songstress refuses to let her assets waste away. Carey says, "I've been working out like mad - you can even punch me in the stomach and feel how tight that is. "But I've got to slow it down cos the other day someone told me I was losing my a*s - and I don't want to lose that."