Kim Kardashian and Kanye West should be grateful to Ray J as it was the sex tape he shot with Kim in 2007 that gave her the success she is basking in today. However, rapper Kanye West, Kim's current boyfriend, has dissed Ray J in a new rap song he performed at "Late Night with Jimmy Fallon."

West changed the lyrics of the song "Bound 2"to diss Ray j. He was joined by R&B legend Charlie Wilson and backed by The Roots for the surprise performance and referred to Brandy's little brother by calling him Brandy's "little sister."

"Brandy's little sister lame man he know it now/ When a real brother hold you down, you supposed to drown."

'Bound 2' - Kanye West Jimmy Fallon Performance 2013

Source: Youtube.com/Roger Cunningham

So who is Brandy? Kim worked as a stylist for Brandy in 2000's when she was dating Ray J. The duo's sex tape has helped propel Kardashian to fame and most talked about person today. There is no denying of the fact that without the sex tape, Kim would not be as famous as she is today.

However, Kanye West is getting possessive about the mother of his child. And why should he not be? Ray J also did a similar thing earlier this year and dissed both Kanye and Kim in his rap song called "Hit it First." The lyrics of the song were provocative and talked about Kim and Kanye both.

"I had her head going north and her ass going south / But now baby chose to go West' and 'Give her no dough to come, but I gave her 10 to leave / I bet I hit it first, unless you took that girl virginity," the lyrics said clearly stating that Kim chose West instead of him though he helped her rise to fame.

Ray J made his message to Kimye quite clear by further shooting the music video with a Kardashian look-alike. Though Ray J called the song a "concept" but Kanye does not seem to buy that explanation and was waiting to launch the counter attack.

Host Jimmy was equally surprised by Kanye's performance. "Cool thing about doing a show in NYC - anyone can drop by. @KanyeWest surprised us and performed "Bound 2" tonight on Late Night! #noj," Fallon tweeted.