A rep for Mary-Kate Olsen insists that the weight-challenged wonder twin is not in rehab for a drug problem — despite the fact that she is being treated at a Utah facility that specializes in alcoholism and other drug addictions. "It is a multitreatment facility," her spokesperson tells USA Today. "Mary-Kate has a team of people working with her, including a renowned psychologist [who specializes in eating disorders] and a nutritionist." Speaking of celebrity denials, Britney Spears' PR person is shooting down reports that the recently engaged pop tart is with child. Says her rep: "No, she is not pregnant." Nuts, yes. Pregnant, no.