The Carrie Diaries 2×12 “This Is the Time” – Carrie (AnnaSophia Robb), Mouse (Ellen Wong), Maggie (Katie Findlay), and Walt (Brendan Dooling) decide to go to their senior prom — at The Waldorf Astoria — together for a final hurrah. Larissa (Freema Agyeman) offers Carrie an opportunity that makes her rethink her plans for the next year. Mouse learns a secret about Donna LaDonna (Chloe Bridges) that could threaten her reign as queen bee. Meanwhile, Sebastian (Austin Butler) hides a big decision from Carrie. Matt Letscher and Stefania Owen also star. Jason Reilly directed the episode written by Sascha Rothchild (#212).