The 13th season of the singing competition came to an end on Wednesday night (21May14) and to celebrate the crowning of a new winner, the trio, alongside former judge-turned-mentor Randy Jackson, joined forces to sing a medley, marking the first time in the show's history that all the judges took the stage to perform together.
With Connick Jr. on the piano, Urban on guitar, Jackson on bass, and Lopez providing vocals, the supergroup sang a mash-up of Cyndi Lauper's True Colors and Fleetwood Mac's Go Your Own Way.
Earlier in the show, Lopez took the stage solo to perform her latest single, First Love.
The night was filled with other superstar performances, including sets from Kiss, Demi Lovato, Paramore, John Legend, Jason Mraz, Lady Antebellum, Sugarland's Jennifer Nettles, Darius Rucker, Aloe Blacc, and season 11 winner Phillip Phillips, who all shared the stage with this season's finalists.
In another Idol first, host Ryan Seacrest showed off his vocal skills by belting out Richard Marx's hit Right Here Waiting, and was joined by Marx himself for a memorable duet.
Caleb Johnson, 23, who had previously auditioned for the programme twice before, was named this year's (14) American Idol, beating 17-year-old Jena Irene to the title.