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The rapper – who's up for eight nominations, including album of the year and rap album of the year for Graduation – has not been officially announced as a performer for the Feb. 10 awards show.
But an insider tells PEOPLE that West, 30, had a rehearsal at the Staples Center Thursday afternoon, performing a moving medley of his hits "Stronger" and "Hey Mama."
West's mother Donda died of heart disease and other factors Nov. 10, one day after undergoing cosmetic surgery. She was 58.
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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