Grey's Anatomy Season 8 Episode 14 All You Need Is Love Will be posted tonight. It's Valentine's Day, and Lexie and Mark draw babysitting duty (for Meredith and Derek, and Callie and Arizona, respectively). Meanwhile, Ben shows Bailey that he knows her better than she thinks; and the ER also fills with romantics, including a 10-year-old girl who has an allergic reaction to chocolates from her valentine; and a man who's hit by a car while chasing down his frustrated girlfriend.