Best performances from the Billiboard Awards - Ariana, 5SOS, Katy and MORE!

The Billboard Awards 2014 were full of fun performances! Here are some of our favorites.

Lorde, who took home two awards, sang “Tennis Court.”

Iggy Azalea performed “Fancy”. Then, Ariana Grande joined her onstage for “Problem”.

5 Seconds of Summer took to the stage for “She Looks So Perfect.”

Katy Perry sang “Birthday” to a fan.

Miley Cyrus and Wayne Coyne from The Flaming Lips covered “Lucy in the Sky With Diamonds” via a streaming video.