How Precious: Gabourey Sidibe's Mom Wows on America's Got Talent Matt Cherette · 06/16/10 02:08PM Alice Tan Ridley has made a living for the past 20 years performing in the NYC subway. Oh, she's also Precious star Gabourey Sidibe's mother. But yesterday on America's Got Talent, all eyes were on Ridley. Her inspiring performance, inside.