The 44-year-old singer, who was not a part of the show in its last season, will appeared alongside her co-judges, newbie Harry Connick Jr and veteran Keith Urban for season 13 of the singing talent hunt, reported People magazine.
"I love this show and I'm glad to be back. Last year I went off and toured the whole world for the first time. It wasn't the easiest thing to fit in this season of Idol, but I do love it so much ... I did miss it," she said.
Lopez's return will probably improve the ratings, which lagged during season 12. But Lopez says she is not concerned with numbers.
"I don't think about that kind of stuff so much. I leave that worry to other people - I have enough worry of my own," she added.