5 Seconds of Summer Perform 'She Looks So Perfect' at Billboard Music Awards 2014 (Video)

5 Seconds of Summer get silly on stage during their performance at the 2014 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 18) in Las Vegas.

The guys — Calum Hood, Michael Clifford, Ashton Irwin, and Luke Hemmings — were introduced by Kendall and Kylie Jenner, but Kendall flubbed their name!

Nonetheless, 5SOS pulled out a great performance with their new single, “She Looks So Perfect”.

“Today was amazing, all the other artists on the show are epic too, how’s everyone doin, I’m excited for “don’t stop” video to be out 🙈 xo” the band wrote on Twitter after the show wrapped.

Check out their performance below!