James Corden's Carpool Karaoke Primetime Special finally returned to TV on Monday night with none other than Christina Aguilera [1]. In addition to performing some of her biggest hits including "Fighter" and "Beautiful," Christina brought out Melissa McCarthy for a fun-filled "Dirrty" duet. She also took a walk down memory lane, reflecting on her Mickey Mouse Club days and admitting that she thought Ryan Gosling probably had a crush [2] on Britney Spears [3]. Prepare for nostalgia overload, and watch the video above now.