Katy Perry brought her grandmother as her date, Miley Cyrus wore the top half of a horrific white pantsuit, and Carly Rae Jepsen out-glammed them all.
Miley Cyrus
(Getty Images / Frazer Harrison)
Miley Cyrus
(Getty Images / Frazer Harrison)
Katy Perry and her grandmother
(Getty Images / Frazer Harrison)
Keenan Cahill
(Getty Images / Frazer Harrison)
