I remember a movie I use to watch as a kid with my sister. It was about a group of girls growing up together. they had a tree house too. One girl put duck tape around her boobs because she was a tomboy. they all met up at the end of the movie. I think one of them got really famous. They ended it at the tree house.
Now and Then? http://www.imdb.com/title/tt0114011/
It’s probably “Now and Then”. Had a great cast Gaby Hoffmann, Demi Moore, Thora Birch, Melanie Griffith, Christina Ricci, Rosie O’Donnell, Ashleigh Aston Moore and Rita Wilson http://en.wikipedia.org/wiki/Now_and_Then_%28film%29