We learned yesterday that Iggy Pop and Queens of the Stone Age/Eagles of Death Metal's Josh Homme had recorded a secret project called Post Pop Depression. Then, Thursday night, the two hit Late Show with Stephen Colbert to perform one of the songs, "Gardenia," and sit down for an interview.

From the hyper-descriptive and sexy-time-centric lyrics, we're guessing Pop, 68, is singing about his wife since 2008, Nina Alu. It's a steady rocker; no punk craziness here. The new album, due March 18, will also feature Queens of the Stone Age’s Troy Van Leeuwen, QotSA/the Dead Weather's Dean Fertita plus the Arctic Monkeys’ Matt Helders. 

The nine-song Post Pop Depression was recorded in the remote Joshua Tree, Calif. starting in January 2015. Iggy told Colbert he proposed the collaboration by texting from his flip phone. “We corresponded by text and prose-poem for a while," he said. "I write poetry.” 

Iggy's last solo record was 2012's Aprés, which consisted mainly of covers of French songs, plus jams by Frank Sinatra and Yoko Ono as well as the Beatles' "Michelle." In 2013, he and the Stooges dropped Ready to Die, their fifth album since 1969.

Watch Homme and Pop on Colbert's couch below: