The lovely Jennifer Garner and Anna Faris have signed onto star in The Bachlorette Party, which Pajiba describes as a Hangover-style comedy but with ladies.  Here's a description of the plot:

A high-school teacher recently left at the altar must now send off her uptight cousin with a huge bachelorette bash. The cousin is marrying the teacher's best male friend. During a drunken bachelorette party, the uptight cousin betrays her fiancée with a drunken indiscretion, leaving the teacher to decide where her loyalties lie.

I'm already confused, but I don't have much faith in the project since the screenwriter is Karen Lutz who has become a hot ticket in Hollywood having recently co-written scripts for an adaptation of Janet Evanovich's One for the Money starring Katherine Heigl, and a remake of The Best Little Whorehouse in Texas.  Unfortunately, Lutz' previous credits include The Ugly Truth and She's the Man.