SYTYCD Canada -- Blake McGrath, Natalie (S1) and Vincent (S2). There were a few more on the red carpet but I couldn't get everyone.
Emily Osmet (Hannah Montana)
Katy Perry who arrived in an ice cream truck for some reason.
Surprise hottie of the day: Jonathan Toews, captain of the Chicago Blackhawks
Cast of The Secret Life of an American Teenager
Jackson Rathbone (Twilight and The Last Airbender)
Jacob Hoggard of Hedley sporting a horrible moustache
Gabe of Cobra Starship
Dave of Faber Drive and some impressive tongue action
Jessica Szohr (Gossip Girl)
Karl Wolf arriving in a DeLorean. I wonder how many of the teens there actually knew what kind of car that was?
JLS, runner up of Britain's Got Talent
Shanae Grimes (Beverly Hills 90210) who is ridiculously skinny
Kristin Cavallari (The Hills)
Twilight-ers Kellan Lutz, who sadly forgot to show us his abs, and Xavier Samuel
Whitney Port (The Hills & The City)
Nina Dobrev (The Vampire Diairies)
Marianas Trench who decided to arrive in a hot tub full of water
Kesha (I refuse to use the $ sign)
Miranda Cosgrove (iCarly).