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Many of today’s chart-topping artists made their way to the MGM Grand Garden Arena in Las Vegas on Sunday night for the 2014 Billboard Music Awards. Hosted by Ludacris, the star-studded evening was kicked off by Pitbull, who brought the Carnival to Sin City by performing the official FIFA World Cup Song “We Are One” with Jennifer Lopez Brazilian singer Cláudia Leitte.

Iggy Azalea brought the cheerleading squad from the University of Las Vegas Rebels, performing the No. 3 in the country “Fancy” with Charli XCX. The medley set continued as pop singer Ariana Grande followed with her Azalea-featured hit song “Problem.” Across the pond in London, Katy Perry celebrated with a colorful and vibrant “Birthday” performance filled with dancers and ballons, as she was whisked around the Newcastle Metro Radio Arena by air on a lift.

Watch the performances below as more will be updated during the live show.

Continue after the jump…..

Pitbull, Jennifer Lopez & Claudia Leitte – “We Are One”

Iggy Azalea, Charli XCX, & Ariana Grande – “Fancy” and “Problem”

Katy Perry – “Birthday”

Lorde – “Tennis Court”

John Legend – “All of Me” and “You & I”

Jason DeRulo, Snoop Dogg & 2 Chainz – “Wiggle” and “Talk Dirty”

Jennifer Lopez – “First Love” & Receives Icon Award

via Mr World Premiere

Previously: 2014 Billboard Music Awards Red Carpet: Nicki Minaj, Jennifer Lopez, 2 Chainz, Ludacris & More (Photos)