The actress's 58-year-old mother Alice Tan Ridley impressed judges on the reality television show earlier this month when she performed Etta James song 'At Last'.
Sidibe told Us Magazine: "I was very proud of her."
She added: "What advice would I be able to give her? She's my mama! She's recorded albums and she's had a great career performing. Now it's just different because it will be in front of more people."