Looking for a Story

It's a light-hearted story from several years ago: Elizabeth and Darcy are on the same delayed airplane. She unknowingly critiques his company's tech and after landing, takes him for burgers. He makes his way to Los Angeles where he is engaged to an actress (Caroline?) who dumps him. Lizzy makes him a birthday cake and he proposes. I can't think of the name of the story and where to find it!