Kim Kardashian's boyfriend serenades her with her new song.

The reality TV star recently debuted her first single, 'Jam (Turn It Up)' and says NBA player Kris Humphries is such a fan, he is always singing it to her when they're on the phone.

She said: "Kris loves it. He sings it to me on the phone."

Kim - who is giving all her profits from the single to St. Jude's Children's Research Hospital - says she did the song to bring her out of her comfort zone and while she enjoyed it, she has no plans to release an album.

She told People magazine: "It was just something I tried. I don't have an album in the works. It was just something that kind of got me out of my comfort zone. And I'm really happy I went for it and did something I'm so not comfortable doing."