Grammys 2015: Lady Gaga and Tony Bennett Join Sam Smith, Ariana Grande, Ed Sheeran & More in Performance Lineup

The 2015 Grammys are going to get a little extra dose of old school class this February. Late Tuesday night (Jan. 27), Lady Gaga announced that she and Tony Bennett will be performing a duet at this year's Grammys ceremony in celebration of their 2014 jazz album Cheek to Cheek.

Gaga tweeted the announcement last night, adding in an extra dose of sweetness for her unlikely friend, who she once admitted "saved her life" and love of music.

It's not known what song the duo will be singing. But, it's set to be from Cheek to Cheek. And Gaga and Bennett won't just be at the Grammys as nominees - the duo are also nominated for Best Traditional Pop Vocal Album.

Gaga and Bennett join an already stacked Grammys performance lineup.

The first round of performance lineup included those old and new, with Madonna, AC/DC, Ariana Grande, Eric Church and Ed Sheeran for the stage.

Later, it was announced that nominee leader Sam Smith, Pharrell, John Legend and Common, Usher and Miranda Lambert were also going to be on hand to spice up the annual broadcast.

Meanwhile, LL Cool J will be there to host the show for the 10th time.

The 2015 Grammys are set to air on Sunday, Feb. 8, on CBS.

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GRAMMYs 2015, Lady Gaga, Tony Bennett
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