If you mean the girl who played April, the name of the actress is Anna Faris. Most recently she was in the movies House Bunny and Mama’s Boy, and she was on a few episodes of Friends as Erica, the pregnant woman whose baby Chandler and Monica were adopting.

Here is her imdb page:

You may not have recognized her as much because she wore much more natural makeup back then than she does now…

Her name is Anna Faris and here’s a list of all the movies/shows she’s been in.