Jessica Simpson reportedly expecting another baby

Jessica Simpson is reportedly pregnant with her second child.

The pop star, who gave birth to daughter Maxwell Drew Johnson in May (12), is said to be expecting another baby with her sports star fiance Eric Johnson.

A source tells Us Weekly magazine, "It definitely wasn't planned. But yes, Jessica is pregnant again. She really is overjoyed!"

Simpson has yet to comment on the report, but she waited weeks before breaking her silence and confirming speculation she was pregnant with Maxwell in October 2011.

The I Wanna Love You Forever hitmaker became engaged to Johnson in November 2010.