Tomlinson's career move marks as a full circle moment for fans: the singer, who has writing credits on 37 One Direction songs, auditioned for the reality competition show in 2010 as a solo artist. Cowell later formed the five-member boy band group on X Factor with solo acts Tomlinson, Harry Styles, Niall Horan, Liam Payne, and Zayn Malik.
This isn't Tomlinson's first jump into judging singing competitions. The star served as a guest judge on X Factor in 2015 and America's Got Talent in 2016.
Tomlinson's friend and bandmate Niall Horan showed support for Tomlinson's new gig on twitter. "Absolutely delighted for ya @Louis_Tomlinson. Going back home to @TheXFactor but as a judge this Time. Huge news!! @SimonCowell"
\u201cAbsolutely delighted for ya @Louis_Tomlinson . Going back home to @TheXFactor but as a judge this Time . Huge news!! @SimonCowell\u201d
For fans worried about Tomlinson's yet-to-be-released solo debut album, he assures everyone that music isn't taking a backseat. He tweeted today about the news: "Gonna do a little video message tonight to talk about everything. Music always my priority obviously! Love you all."