Watch 5SOS Rehearse For The VMAs! (Yes, This Is Really Happening!)

The guys perfect 'Amnesia' before Sunday's show at 9 p.m. ET.

5 Seconds of Summer have their band shirts pressed, their guitars tuned and their extremely cool set constructed -- they're ready for the 2014 MTV Video Music Awards.

Ashton, Luke, Michael and Calum rehearsed "Amnesia" at the Forum in Inglewood, California, on Saturday (August 23), a day before the big show. The guys wore their signature band tees as they worked out harmonies and perfected lighting.

Related: 5SOS Transform Into Emojisā€¦ Will They Change Back Before The VMAs?

The band is up for Artist To Watch at Sunday night's show. Voting is still open for Best Lyric Video -- the socially voted category they're nominated for with Demi Lovato, Katy Perry, Austin Mahone and Ariana Grande. Tune in to see which 5SOS member will have a wardrobe malfunction.