McCartney says Lopez is pregnant

Jesse McCartney has revealed that Jennifer Lopez is expecting her first child.

During a radio interview for Atlanta station Star 94, the singer revealed that his girlfriend Katie Cassidy has signed up to play Lucy Ewing in the new Dallas movie.

When the DJs joked that he could find out why Jennifer Lopez was "fired" from the project though, the 19-year-old singer let a bigger secret slip.

"She didn't get fired. She's pregnant," he replied.

DJ Vikki Locke later told Buzz: "It was kind of a 'Oops, what did I just do?' moment...When the microphones were off, he just looked at the woman with him and asked, 'Was I not supposed to say anything?"