Ashley Olsen has canceled her trip Down Under for next week's Australian premiere of New York Minute. Understandably, she wants to stick close by twin sister Mary-Kate, who's reportedly undergoing treatment for an eating disorder. "Ashley has decided to be with her family at this time," says Robert Thorne, CEO of the twins' Dualstar Entertainment Group. "While it is unfortunate that plans have been canceled, Mary-Kate and Ashley appreciate everyone's support and understanding."