"She's absorbing Ellen's salary which is why Ellen resigned today," the insider told OK.
Lopez's longtime manager Benny Medina organized the deal, according to People, which reported current judges Randy Jackson and Kara DioGuardi will both return for American Idol's tenth season and join the 41-year-old singer and actress on its judging panel.
"It's true," an industry source toldPeople. "She's excited about it."
Whether American Idolwill also replace Simon Cowell -- who left the show after this past May's ninth-season finale to launch an American adaptation of his British The X Factor reality competition that will debut on Fox in Fall 2011 -- and continue with the four-judge format it has used the last two seasons remains unclear.
According to Deadline Hollywood, which first reported the news of Lopez's addition, Idol producers have been attempting to replace Cowell with Elton John. However he is reportedly "asking for too much money and has too many touring commitments he can't get out of," resulting in Aerosmith singer Steven Tyler possibly being offered the position.
Fox and DeGeneres announced her departure in a Thursday evening press release.
"A couple months ago, I let Fox and the American Idol producers know that this didn't feel like the right fit for me," DeGeneres said in a statement. "I told them I wouldn't leave them in a bind and that I would hold off on doing anything until they were able to figure out where they wanted to take the panel next."
Rumors that American Idol will undergo a large tenth-season shakeup that may result in the replacement of its entire judging panel have surged since multiple reports that former Idol producer Nigel Lythgoe -- who left the show in 2008 to focus on So You Think You Can Dance -- is near a deal to return to the show surfaced on Monday.
Earlier this year, Lythgoe repeatedly told reporters he would address Cowell's exit by replacing Idol's entire judging panel and return to a three-judge format if he were still in charge of the show.
"I'd lose the fourth judge, I don't like four judges. I'd keep Ryan Seacrest and probably change the whole panel to go with [Elton John]," Lythgoe told the New York Post in March.
"I would replace the entire judging panel," he told Zap2it in April. "I don't think it really works replacing one person. They don't have a great deal of chemistry at the moment. Ryan and Simon have fallen out. It's uncomfortable to watch. Ellen hasn't worked out as well as we would have hoped."
According to recent reports, Idol has also been considering Chris Isaak, Harry Connick Jr., Jessica Simpson, and Justin Timberlake as possible judging panel additions. In addition, Sean "Diddy" Combs and Bret Michaels have also expressed interest in the show recently.
DeGeneres joinedAmerican Idol last September -- after the show had already conducted its nationwide ninth-season callback auditions for the judging panel without her -- under what was reportedly a five-year contract.
While it will be her first regular on-camera role, Idol's judging panel won't represent Lopez's first foray into reality television.
In 2007, she executive produced and made several cameo appearances in DanceLife, an MTV reality series that followed the lives of six dancers working to make it in the dancing business.