Jessica SimpsonAfter a string of romances that left her heart broken, Jessica Simpson has finally found love with ex-NFL player Eric Johnson -- according to her brother-in-law, rocker Pete Wentz.

"He's a really smart guy, and Jessica really loves him," Wentz, who is married to Simpson's younger sister, Ashlee, told PEOPLE at Monday night's VH1 Save the Music Gala in New York. "I think that's the most important thing, seeing her happy."

A source close to Simpson agreed, telling PopEater, "She is really happy. Eric is such a good guy ... they are great together."