|Jamie Lee Curtis||Gail|
|Betty White||Grandma Bunny|
High school was hell for Marni, so she is horrified to learn that her brother's fiancee is Joanna, the nemesis of her teen years. Marni intends to expose Joanna's evil side to her family, but the situation really explodes with the arrival of Joanna's Aunt Ramona, who was the high-school rival of Marni's mother . When both older women revert to their teenage personas, the result is extreme wedding turmoil.