John Legend to Perform GRAMMYs In Memoriam, Demi Lovato to Sing Bee Gees Tribute

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The 2017 GRAMMYs just got a whole lot more star power.

John Legend will be taking the stage on Sunday to sing the in memoriam tribute, while Demi Lovato will be pairing up with singers Tori Kelly and Andra Day, as well as Little Big Town, to honor the music of the Bee Gees, the Recording Academy announced on Tuesday. This year marks the 40th anniversary of 1977's Saturday Night Fever.

In addition, Kelsea Ballerini and Lukas Graham are also set to make their GRAMMY stage debut on Sunday, the Recording Academy confirmed. Ballerini is nominated for Best New Artist this year, and Danish band Lukas Graham is nominated for Record Of The Year and Best Pop Duo/Group Performance for their hit "7 Years."

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Previously announced performers at the GRAMMYs include Adele, Katy Perry, Bruno Mars, Chance the Rapper, Daft Punk, Alicia Keys, Carrie Underwood, Keith Urban and The Weeknd.

The 59th annual GRAMMYs airs Sunday, Feb. 12, at 8 p.m. ET/5 p.m. PT on CBS.

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Last week, multiple sources told ET that the one and only Beyonce -- who received nine GRAMMY nominations for her album, Lemonade -- is set to hit the GRAMMYs stage. The 35-year-old singer was spotted on Thursday rehearsing at a secret location in Los Angeles, California, with a glam squad, camera crew and her team of dancers all in tow.

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