Last week, 5 Seconds of Summer overthrew Pop Clash champs the Vamps to take the title. Although the group secured 2/3 of the votes, will 'She Looks So Perfect' be able to top Austin Mahone's 'MMM Yeah'? It's up to you to decide!

We have a pretty strong feeling that 'She Looks So Perfect' is going to be a huge song this summer! From it's bombastic chorus to that catchy American Apparel reference, 5 Seconds of Summer's track is a great jam. The song makes us want to rock out with someone special.

And as long as we're listening to amped up tracks, we've totally got Austin Mahone on our playlist. His Pitbull collabo, 'MMM Yeah,' is beat-heavy and club-ready. Austin's voice -- and moves! -- are silky smooth, and we predict this is going to be a total banger.

Which track should win this week's Pop Clash? Vote for 5 Seconds of Summer or Austin Mahone once an hour until the polls close at 3PM ET on March 31.

Watch 5 Seconds of Summer, 'She Looks So Perfect'

Watch Austin Mahone, 'MMM Yeah' Feat. Pitbull