Clubgoers at Mister H at Mondrian SoHo Friday night knew someone important was arriving when security roped off a large section of the downtown hot spot. Within minutes, Madonna arrived, looking fresh faced, dressed casually in all black and donning a black-rimmed hat. She was accompanied by 20 of her dancers, all escorted by staff to tables in her private area. But Madonna was not happy to find out her entourage had taken over a large chunk of the dance floor. A spy told us, “When Madonna realized her private area cut off a majority of the dance floor, she was seen chatting with security and asked them to give her crew a smaller space so everyone in the club would be able to have a place to dance.” The spy added, “Madonna was sitting down, watching, as her dancers took to the floor to show off their skills. But when the DJ began to play Whitney Houston’s ‘I Wanna Dance With Somebody,’ Madonna perked up and started lip-syncing the words.”