For months, Foo Fighters have teased that their next album Concrete and Gold would feature a huge pop star on the album that would surprise many fans. The identity of said mystery pop singer has finally been revealed to be none other than Justin Timberlake, thanks to a new Rolling Stone interview.

According to the article, Justin Timberlake popped by the studio where they were recording, and enjoyed what they were playing. The collaboration quickly led to a friendship between him and singer Dave Grohl. "We'd drink whiskey in the parking lot," Grohl says. "He was really, really cool. Then the night before his last day, he says, 'Can I sing on your record? I don't want to push it, but – I just want to be able to tell my friends.' " So the band had him add some "la la la's" to one track. "He nailed it," Grohl says. "I'm telling you – the guy's going somewhere."

The identity of who would be on the record has been speculated about for months. Many assumed it would be Taylor Swift or Adele due to said musicians showing a lot of love for the Foos in the past, but Grohl was kind enough to nix those names immediately. When fans got word that Paul McCartney would appear on the record, many assumed that he was the big guest vocalist, but the Beatles legend is playing drums on one of tracks.

We're curious to hear what Timberlake has to add on the new album, however strange it may sound. You can read the full interview over at Rolling Stone.

In other Foos news, the band just launched a quick animated short teasing a "making of" video for Concrete and Gold. The new video will be released Sept. 15.

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