Watch out, future Pop Clash competitors. Charli XCX is out for the win! The singer upset previous victor Ed Sheeran in his second round of Pop Clash. This week, Charli XCX's 'Boom Clap' is going head-to-head with the Vamps' 'Somebody to You.' Who should win this round of Pop Clash?

Who can resist the infectious chorus of Charli XCX's 'Boom Clap'? (We know we're guilty of listening to it all the time!) The track, which was featured on the soundtrack for 'The Fault in Our Stars,' perfectly captures the giddy rush of falling in love and is the perfect summer jam.

If you want a sun-kissed track to celebrate the warmer weather, look no further than the Vamps' 'Somebody to You.' The upbeat song also celebrates falling for someone special -- and even features the vocals of Demi Lovato! Not only is the beat crazy-catchy, but the lyrics are so sweet.

Which song should win this week's Pop Clash? You can vote for Charli XCX or the Vamps once an hour until the polls close at 3PM ET on July 7.

Watch Charli XCX's 'Boom Clap' Video

Watch the Vamps' 'Somebody to You' Feat. Demi Lovato Video