Jay Z might be the best man in Kim Kardashian and Kanye West's wedding, but that hasn't stopped him from making fun of the couple's upcoming nuptials.

Kim and Kanye Land in Paris Before Wedding

An insider revealed Thursday, "Jay thinks the entire Kimye wedding is a joke and it's being blown way out of proportion."

Not only that, the source added that it's not uncommon for the Tom Ford rapper to diss his BFF and his wife-to-be.

Kim Clears Up Wedding Rumors

"He likes Kanye and Kim, but totally talks smack about them behind their backs. When he was asked about the wedding he just laughed and said, 'The circus goes to Paris!'"

Still, Jay Z put on his best man hat and even gifted West with a gold-plated diamond-encrusted flask and a $10,000 bottle of scotch for his special day.

The same source said, "Kanye was almost jumping up and down, he was so excited. He was running around Kris' house to find Kim saying, 'Baby, look! Look! Jay and B are coming!'"

This was apparently amazing news as Jay originally said he would not be his best man if the wedding would air on television. But while he maintains his relationship with West, it's Kardashian that he's not too fond of.

The insider said, "Jay doesn't mind Kanye, but Kim is a big knock to his reputation. She doesn't exactly have street cred. At least Jay and Kanye make music. Kim doesn't really do anything. She's got no real talent and if there's one thing Jay respects it's an independent, successful, talented woman. that's why he's with Beyoncé."

Kardashian and West are said to be tying the knot May 24 in Florence, Italy after lunching in Paris.