It's my daughter's birthday next week and am planning a theme party for her. Any ideas for what themes are in fashion right now?

For little girls, I think the whole princess/fairytale theme will never go out of style. How old is she? If she has a favourite Disney Princess, you can go along those lines. I went to 2 Frozen-theme parties last year and one that is Underwater themed (The Little Mermaid). If it were my daughter and she's not old enough to choose/know - I'd throw a Chanel theme party haha. I love the black and white look of the brand. The guests can come dressed up in their best black/white clothes and I'd dress my little girl to look like a mini Audrey Hepburn.