Kim Kardashian Premieres New Song, 'Jam' (Listen)

The reality star -- who will donate a portion of the proceeds to charity -- admits she's "nervous… this is a really big deal."

Kim Kardshian released her new single, "Jam," on Ryan Seacreast's KIIS-FM radio show Wednesday.

"I think it's only normal for me to be nervous," said the reality star. "I'm human… this is definitely something that I don't do. I needed to step outside my comfort zone. This is a really big deal."

Lyrics include "Imam burn it out tonight, its goin down/By live via satellite/And all I see is angels in my eyes/Buzz got me way up in the sky."

Kardashian (whose family made $65 million last year, according to a Hollywood Reporter cover story) wil donate a portion of the proceeds to St. Jude Children's Research Hospital.

Kardashian isn't the first reality star to cross over into music.

Paris Hilton and The Hills' Heidi Montag have also released songs.

The Kardashian family earned $65 million last year, The Hollywood Reporter revealed in a cover story.