Rumors have been swirling that tiny twin Mary-Kate Olsen, 22, may be expecting her first child -- but is it true?

According to Olsen's reps, that is a firm no. "Mary-Kate is absolutely not pregnant," reps for the miniature mogul told Us Weekly. Published reports suggested that Olsen, who previously battled anorexia, may have gained weight recently, and attributed it to a growing baby bump.

In MK's new book "Influence" -- written with twin sister Ashley -- the girls talk about whether or not they want a family one day. "I don't feel the need to get married," Mary-Kate says in the book. "Ashley wants children. I'll be a great aunt or godmother."