Singer, actress, rapper, producer, and commercial pitchwoman Queen Latifah has a lot on her plate these days. Her new film, Mad Money -- with Diane Keaton and Katie Holmes -- opens this month, and she has been named a pitchwoman for Jenny Craig. But she admits that one of her biggest thrills lately was getting veteran pop star Stevie Wonder to appear on her 2007 CD, Trav'lin' Light.

Wonder provides a harmonica solo on the moving tune "Georgia Rose," and Latifah says that although the Motown legend isn't singing on the track, his playing is just as distinctive. She explained: "I was thinking it would be cool to put a harmonica solo on it. And I was like, I wonder if Stevie would do it? And like literally Stevie was in the studio a week later, it was weird. It was like -- he just came in and he just, ah ... Stevie just has a sound, whether it's his vocals, whether it's his production, or whether it was him on an instrument. So, like, to have him on that was just amazing. It was just so cool, it was like a dream come true. "

Latifah remains on the smooth jazz radio airplay charts this week with her version of Phoebe Snow's "Poetry Man."

Mad Money opens in theaters on January 18th.