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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.
