[Mariah Carey], who had her twins Moroccan Scott and Monroe on April 30, partied at Chelsea hot spot Juliet Supperclub until 2:30 a.m. yesterday morning with two female friends and without hubby Nick Cannon. One witness said:

"Mariah came into the crowded club with a small entourage and was surrounded by people taking photographs. She was smiling, friendly with everyone and seemed relaxed. It seems motherhood is suiting her. But her diva ways are definitely still there -- it was very hot, and she had a young man fanning her throughout the night with a big red fan.

"She spent a lot of the night dancing, and was nice to anyone who approached her. But the club was very crowded, so she asked if she could have 'a minute' of quiet time in the bathroom. The ladies' was cleared out, and Mariah ordered a $450 bottle of Perrier Jouet, and had a few glasses in the privacy of the bathroom before coming back out to join the masses."