Louis Tomlinson and Liam Payne are said to have been working with Good Charlotte on new music.
The 'Midnight Memories' hitmakers joined Good Charlotte's Joel and Benji Madden at a studio in the United States on Saturday March 8 to work on new tracks, which are expected to feature on One Direction's upcoming fourth album.
The collaborators took to social media sites to unveil the new partnership and speak about their excitement over the project.
Louis Tomlinson wrote: "Great working with the Good Charlotte boys today!"
Good Charlotte's Joel Madden then posted a picture of himself, Benji, Liam and Louis on his Tumblr page with the caption: "Noice! The London boyz putting in tha werk in the studio. (sic)"
Joel's twin brother Benji even teased that the new material could be a surprise to One Direction's fans - who are affectionately nicknamed "Directioners".
He wrote on Twitter: "Good day today w/ @Louis_Tomlinson and @Real_Liam_Payne lotta laughs #1D #Directioners their new album is crazy. homies #Noice (sic)"
Although Liam and Louis' bandmates - Harry Styles, Niall Horan and Zayn Malik - weren't involved in the collaboration, Harry has also been working on some new music as he teamed up with Irish rock band Kodaline last week.
The band posted a drawing on their Twitter page with the caption: "In the studio with @Harry_Styles in LA writing a tune, sounds massive. He's gone and done a drawing of us.. x (sic)."
One Direction began working on new material for their fourth studio album earlier this year and it's expected to be released later this year.
Tagged in Niall Horan Liam Payne Louis Tomlinson