Jay Z, Beyonce to perform at Kim Kardashian's wedding?

Pop star Beyonce Knowles and her rapper husband Jay Z will reportedly be performing at the wedding of Kim Kardashian and Kanye West.
The couple will apparently earn USD 2 million for their performance, reported Contactmusic.
"Jay Z and Beyonce will also perform at the wedding, as long as their last-minute negotiations with E! work out. The two have demanded USD 2 million for a short show," a source said.