Jay Z has FORBIDDEN Kim Kardashian from coming ON TOUR with Kanye and Jay Z.

Well now we're told that Jay Z and Beyonce are NOT going to be in the same ROOM with Kanye and Kim Kardashian.

According to TWO VERY RELIABLE sources, that Jay Z and Beyonce REFUSED TO ENTER Carmelo Anthony's special "Audemars" dinner on Monday night - until AFTER Kim and Kanye left.

One insider told us that Jay Z and Bey WAITED OUTSIDE, in their van - until Kim and Kanye left. Tells the insider, "Beyonce doesn't want to be in the same [photo] shot with [Kim Kardashian]."

An insider finds out that Kim and Kanye ONLY STAYED for 5 minutes. And after they left, Beyonce and Jay Z arrived and enjoyed themselves until the EARLY MORNING hours. The insider explained, "Swizz Beat was DJing, and Jay and Bey had a great time."