J Lo pulls the diva moves on TomKat excursion

Jennifer Lopez ticked off fellow celeb passengers on a private jet taking them to the TomKat wedding- by claiming all the best seats for her party.

Other celebrity passengers including Jada Pinkett Smith, Leah Remini and Cameron Crowe "were shocked when they boarded the luxury 757 to find Lopez had taken over."

Us Weekly reports, "Jennifer Lopez sent her assistant to secure seats by laying her belongings on all the best seats!" Aww. Remember doing that in the fourth grade lunchroom?

Lopez kept up the diva behavior at a group dinner by refusing to stick to the informal dress code. The mag says, "The November 16 welcome dinner was supposed to be casual. But J.Lo, of course, wore a gown. So much for casual." Did she wear white to the wedding too?