Lady Gaga debuted a brunette hair transformation via Instagram. The singer also wore a Bruno Mars t-shirt, which fans think is a hint at a collab between the two artists.

Hours after "Bad Romance" singer's post, Mars, 38, shared a photo on his Instagram account of him wearing a Lady Gaga t-shirt. The coordinating posts are fueling rumors that a collaboration ...

Lady Gaga and Bruno Mars are grinning all the way to the grave in the music video for their new surprise collaboration, "Die With a Smile," which Entertainment Weekly has learned is a special one ...

Lady Gaga joined Bruno Mars onstage at the grand opening of the Intuit Dome in Los Angeles on Aug. 15 for a surprise performance of their new duet, 'Die with a Smile.' ...

Seemingly teasing the new song, Mars posted a picture on Instagram wearing a shirt with Gaga’s name on it earlier this week. Gaga previously teased new music on her Instagram July 18.

Lady Gaga and Bruno Mars' duet "Die with a Smile" is finally here -- and it's a whole vibe. The music superstars debuted their song overnight, dropping an accompanying music video featuring them ...

On Aug. 13, Gaga showed off a Bruno Mars T-shirt while playing the piano on Instagram, and the next day, Mars returned the favor by wearing her merch.

In the release, Bruno Mars heaped his own praise on his pop peer for her artistry. "Getting to work with Gaga has been an honor. She’s an icon and she makes this song magical.

Lady Gaga and Bruno Mars have released a collaboration, “Die With a Smile.” Interscope Records “Bruno and I have a lot of mutual respect for each other,” Gaga said in a statement.

Rather than putting Mars in the spotlight with his tried-and-true throwback formula, these songs take the lead of their collaborators: “Smile” is a vintage rock ballad recalling Gaga’s late ...

Hours after "Bad Romance" singer's post, Mars, 38, shared a photo on his Instagram account of him wearing a Lady Gaga t-shirt. The coordinating posts are fueling rumors that a collaboration ...