Jay Z reportedly thinks Kanye West and Kim Kardashian's wedding ''is a joke.''

The 'Otis' rapper, who married Beyoncé Knowles in a secret ceremony in New York City in April 2008, is said to be less than impressed by the couple's lavish three-day, two-country nuptials, which kicked off with a rehearsal brunch at Valentino's estate outside Paris today (23.04.14), and has branded the affair a ''circus'' despite agreeing to be Kanye's best man at the Forte Di Belvedere in Florence, Italy tomorrow (24.05.14).

A source told gossip website RadarOnline.com: ''Jay thinks the entire Kimye wedding is a joke and it's being blown way out of proportion.

''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!'''

But despite his feelings, Jay Z sent Kanye a special gift.

The source said: ''The best news came when Jay sent a gift to Kanye with an inscription referring to Jay Z as the rapper's 'Best Man.' The gift was a gold-plated, diamond-encrusted flask, delivered with a $10,000 bottle of scotch, for Kanye to have for his wedding day.''

Kim and Kanye enjoyed a pre-wedding celebration at designer Valentino Garavani's Château de Wideville, a 17th-century residence, with 50 close friends and family members at 1pm today.

A source told E! News that they dined on eggs Florentine and toasted the couple with champagne.

The insider added that both Kim and Kanye were in fantastic moods and didn't seem stressed at all ahead of their wedding.

The group received a private tour of the Palace of Versailles tonight before jetting to Florence in the morning.