Bridgit Mendler shows off her purple prom dress to Shane Harper in this new still from Good Luck Charlie.

In the first all-new episode “Dress Mess”, Amy (Leigh-Allyn Baker) is sure her old prom dress would be the perfect fit for Teddy (Mendler) to wear to her dance, and PJ (Jason Dolley) forgoes his prom to go to another one, only to regret his choice when he discovers that his date is home schooled.

And in “Amy Needs A Shower”, In the midst of Amy’s baby shower, Charlie (Mia Talerico) reveals the surprising reason behind her mom’s motive for having the party.

Meanwhile, Teddy and Ivy (Raven Goodwin) find themselves hosting the most boring show at their local radio station, and Bob (Eric Allen Kramer) makes PJ and Gabe (Bradley Steven Perry) compete for a playoff game ticket by proving who knows their dad best.

It all starts on Sunday @ 7:30PM ET/PT on Disney Channel. 20+ pics inside…