Young superstar Amanda Bynes and the lovely comedienne Jennie Garth continue their hilarious antics as sisters who have pushed their relationship to the limit by moving into a New York loft together — with Holly (Bynes) overturning every element of Valerie's (Garth) well-regimented life. In the third season of this cheerful comedy, Holly returns from a summer abroad with a rock star boyfriend, to the dismay of cute messenger Vince (Nick Zano), who is now sharing an apartment with Holly's pal Gary (Jonathan). Having enjoyed a fling with Tina (Allison Munn), Gary joins Holly at New York University. With her public relations business floundering, Valerie happily gets engaged, prompting her excited friend and employee Lauren (Leslie Grossman) to launch major wedding plans. Through it all, Holly and Valerie know that their affection and concern for each other's happiness will get them out of every jam. Luke Perry (Garth's cast mate on Beverly Hills, 90210) guest stars.