Will Smith's daughter, 9, lands record deal

"No such thing as too young," says Jay-Z, who signed her

Will Smith's 9-year-old daughter has landed a record deal.

Jay-Z's Roc Nation label signed Willow Smith (whose brother, Jaden, starred in box office hit "Karate Kid" earlier this summer) after her song, "Whip My Hair" became a YouTube hit with 1.2 million plays and counting. (Lyrics include, "Get my swag on…we ain't doing nothing wrong/don't tell me nothing/I'm just trying to have fun/so keep the party jumping.”)

Explained the rapper on Ryan Seacrest's KIIS-FM radio show Thursday, "When you have that sort of talent, there is no such thing as too young."

"I heard the record first before I knew that it was recorded by a nine-year-old and I was like, man that record's a smash," Jay-Z went on. "I believe in superstars. I believe in big records and in superstars and I think [Willow] has both."

"She has a child's innocence but she has a clear vision of who she is and who she wants to be," he added. "I can only imagine that's how Mike [Michael Jackson] was as a young kid, he knew exactly what he wanted."

Willow -- who has made a splash on red carpets this summer with her funky style -- assured Seacrest that she is actually just 9. "You could look at my birth certificate, or you could ask my mom,” she said.