Sparks told PageSix that contestants could learn a great deal from Minaj, who is reportedly in final talks for an $8 million (£5.06m) American Idol deal.
"It would be so fun to see what she does because she's so unpredictable. I met her the other day, and she is so sweet," the Sparkle star said of Minaj.
Country music star Urban is also rumoured to be in talks to join American Idol's judging panel for a reported $3-4 million (£1.9-2.5m).
Sparks said of Urban potentially judging American Idol: "I think it would be cool to bring somebody with a country flair who has that experience."
Mariah Carey is thus far the only confirmed American Idol judge for the 2013 season.
Nick Jonas, Kanye West, P Diddy and Snoop Dogg are among the stars also rumoured to be in talks with Fox execs.
American Idol returns to Fox early next year.
Watch Nicki Minaj's 'Starships' music video below: