Few days back a Gaga fan site tweeted a snippet of a Grammy promo clip declaring, "Lady Gaga duets with Metallica", which has now confirmed by Rolling Stone.
While Gaga, 30, is a regular performer at the Grammys; she appeared at the ceremony last year to pay tribute to David Bowie, Metallica has not been on the ceremony since 2014, when they performed the song "One" with the classical pianist Lang Lang.
Metallica's "Hardwired" is nominated for Best Rock Song this year.
The band is competing with David Bowie, Radiohead, Twenty One Pilots and Highly Suspect.
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