No irons allowed but some people take steamers. Recently Celebrity added these to he banned list as well. Not sure about Princess. Kind of silly really. Are they going to ban steam hair curlers or curling irons? I have taken a steamer but didn't use it much. Search the best methods for packing clothes to avoid wrinkles ie. roll a dress around a rolled up T-shirt. Hang garments up when you board and hang items in the bathroom when you are taking a steamy shower.