Taylor looked like the most glamorous prom queen ever in a rich red Elie Saab couture creation, plus Lorraine Schwartz jewels and a matching crimson lip. Lucy went hippie-chic in a pale pink tiered Julien Macdonal design featuring an embellished neckline accented with coordinating sandals and an EF clutch. Unlike Taylor who went for a pulled back 'do, Lucy kept her hair down.
Both girls nailed it, but which star do you crown the best dressed of the night?
Click through the above slideshow to see full-length pics of Taylor and Lucy's looks, then vote for your favorite in the poll.