Gabi is feeling down about her birthday, even after she discovers she and Ms. Wilson share their special day. When Gabi learns Ms. Wilson made a promise to meet a former boyfriend (special guest star Carl Reiner) in Vegas, she decides a road trip to Sin City is the perfect way to get over her birthday blues. Meanwhile, Josh is desperate to figure out why Gabi is so upset about her birthday, and Yolanda and Elliot scheme to keep Gabi's forgotten birthday gifts.