If there's one big winner in Kim Kardashian appearing nude in Paper magazine and with her break-the-internet campaign, that's her former boyfriend Ray J.

Kim Kardashian and Ray J's tape may have been filmed and distributed way back in 2003, but it has surprisingly zoomed to become the biggest-selling sex tape in history.

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The couple's lovemaking eventually trampled Pamela Anderson and Tommy Lee's 1995 video.

Kardashian took the No. 1 spot from Anderson thanks to heightened interest on the reality star since her nude shot at Paper magazine last week.

TMZ reports that sales of her sex tape have ballooned to exponential proportion.

Ray J signed a deal with Vivid Entertainment, distributor of the couple's sex video, which allegedly pays him US$90,000 every quarter. But with the sales shooting up, the 33-year-old reportedly earned US$50,000 from the last week alone.

According to Vivid Entertainment president Steve Hirsch, the increase sales of the sex tape has pushed it to greater heights.

Kardashian was reportedly paid US$5 million by Vivid in 2007 in exchange of giving the company the rights to distribute the sex tape.

The 34-year-old reality star has a net worth of US$65 million. Meanwhile, rapper and music producer Ray J has been valuated to be worth US$6 million.

TagsKim Kardashian, Ray J