Jennifer Lopez's publicist says that the star is "100 percent not pregnant," denying a rumor started by singer Jesse McCartney on an Atlanta radio station.

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McCartney, telling Star 94 that his girlfriend, Katie Cassidy, is in the movie version of the TV show "Dallas," said that J-Lo was not canned, she left because of pregnancy.

A source described as "close to Jennifer" told US weekly that McCartney "doesn't even know Jennifer."

"His girlfriend has never even met Jennifer," the source said. "She just got cast in the movie after Jennifer was already out. Jennifer is shooting the cover of a high fashion magazine. Do you think she could wear couture if she was pregnant?"