I am sorry if you are looking for a yaoi because I don't know any with a plot like that, but there is a shoujo manga which sounds similar; it's called W Juliet.
http://mangafox.me/manga/w_juliet/
Love Stage? The cross dressing shit happened when they were kids though, is that what you're talking about?
This manga? though the cross-dressing was accidental. people mistook her for a boy and she kept on the charade
http://www.mangago.zone/read-manga/yume_chu/
Thanks , very much, i found it. :)ヾ(☆▽☆)
Hi guys, will you help me? Im looking for a manga, it about guy who wants to be an actor / model , then he meet this another character who is cross dressing to be model or actor as well. Im not sure if its ongoing or what, but please help me its making mw crazy.