Yes! Lady Gaga is a self-professed metalhead. She's said Iron Maiden changed her life, lounges in Anthrax shirts was spotted at a SXSW metal show, so the girl's cred is in tact.

The pop star and jazz icon first met in 2011 after Gaga performed a rendition of Nat King Cole's "Orange Colored Sky" at the Robin Hood Foundation Gala in New York City. Soon after, the talented duo collaborated on Bennett's Duets II album that same year, singing the classic, "The Lady Is a Tramp."

In October, Gaga announced her engagement to talent agent Christian Carino whom she had met in early 2017.

— -- Metallica and Lady Gaga's joint performance was one of the most talked about moments at the Grammys, and even despite a technical mishap, they still lit up the stage – quite literally, with lots of pyrotechnics. But how did a heavy metal band decide to team up with one of the world's biggest pop stars?