*Someone is claiming to have been at Los Angeles baby boutique Petit Tresor this week when one of Mariah Carey's assistants supposedly called in to talk about furnishing a nursery.

       The eavesdropper ran to the New York Daily News with all the dirt.

      "Mariah's office asked if the store could send fabric samples and if its designers could work with the theme of - you guessed it - butterflies!" reported the paper's Rush & Malloy column. "Word is the Petit crew is sending pictures of the nursery they just finished for Jennifer Lopez and Marc Anthony's twins."

      Rush & Malloy continued: "A friend of the couple tells us Carey had said she was working on a concept to make Cannon's L.A. home more comfy for a lady with a whole lot of shoes and dresses. But apparently, she's also thinking about cribs and changing tables. Her assistant asked if Petit Tresor could shut the store for a private conference next time she's in L.A."

      This latest gossip item fuels existing rumors that Mimi and her new husband Nick Cannon are expecting, but her manager Benny Medina says the reports are not true.      

       Meanwhile, Cannon rented out Six Flags Magic Mountain in Valencia, Ca. Tuesday night and threw a surprise bash for his wife and 100 of their friends, reports People magazine.

       "This is wonderful," Carey told the staff as she entered the theme park. "The best surprise ever!"       

       After posing for photographs, Carey downed her glass of Chardonnay before they both jumped on Tatsu, one of the park's famous roller coasters.      

       The private party included candlelit tables, lavender and pink balloons (her favorite colors), and faux butterflies placed in the vases and hand painted on cupcakes. The wood sign in front of the Grand Carousel read "Nick and Mariah – A Love Story."