Eagle-eyed fans noticed that at one point, the star tilts toward the camera to showcase the front of her oversize gray t-shirt, which features singer Bruno Mars. Joaquin Phoenix Says Lady Gaga ...

Related: Lady Gaga Debuts Dark Hair While Showing Off Bruno Mars T-Shirt — and Fans Think It's a Collab Hint “Bruno and I have a lot of mutual respect for each other and were talking about ...

Gaga herself teased "Die with a Smile" one day before by posting a snap in a Bruno Mars t-shirt. The pair later surprised Mars' crowd at the Intuit Dome in Los Angeles for the live debut of the ...

Sporting a new sleek black hairstyle, fans were quick to notice Gaga wearing a t-shirt with a picture of Bruno Mars. One fan said: “The bruno mars t-shirt?? The collab is REAL OMG.” ...

Sartorially, they’ve been suggesting the duet for the last few days. On Aug. 13, Gaga showed off a Bruno Mars T-shirt while playing the piano on Instagram, and the next day, Mars returned the ...