Rapper Jay Z has reportedly rejected a chance to be Kanye West's best man at his wedding to socialite Kim Kardashian because he is totally against appearing on her reality TV show.

The 44-year-old only agreed to the idea initially, provided his family, including wife Beyonce Knowles and their two-year-old daughter Blue Ivy, wouldn't be filmed for "Keeping Up With The Kardashians".

"Jay is Kanye's closest friend so he wants him to be best man,` contactmusic.com quoted a source as saying.

"Jay agreed initially but had one condition - under no circumstances can there be any reality TV shows filming him, his wife, Beyonce or daughter Blue Ivy during the ceremony,` the source added.