If Serena van der Woodsen were to attend the Michael Kors show in 2018 on Valentine's Day, we imagine the costume department would put her in Blake Lively's outfit. She looked like she'd stepped out of an episode of Gossip Girl wearing a red vinyl trench coat by Michael Kors with white Louboutin heels with red hearts on the toes and a Louis Vuitton red top-handle bag. She wrote on Instagram: "If I'm this obnoxious at 30, you can only imagine how EXTRA I was on 'spirit day' at school." Keep scrolling to see her look, and see the coat we've found for under £40.