Way to go, Glamberts! In his first week on Pop Clash, Adam Lambert's "Ghost Town" beat out reigning champ Rihanna. This week, the former American Idol star faces off against Britney Spears and Iggy Azalea's "Pretty Girls." Who should win the Pop Clash?

Adam's EDM-tinged "Ghost Town" is the single we've been waiting to hear. With its mix of guitar strums and intense rhythm — not to mention the vulnerability laced throughout the lyrics — this track has "Adam Lambert" written all over it. His tone conveys all of the lonesomeness we've ever felt.

Britney and Iggy's "Pretty Girls," on the other hand, is sassy and confident. If Iggy's 2014 smash "Fancy" was about livin' the high life, then "Pretty Girls" is a tribute to the ladies who "Wipe the floor with all the boys." From the infectious beat to the over-the-top lyrics (Who can resist singing "We're just so pretty!"?), this track is the front-runner to be this year's song of summer.

So which artist should take this week's Pop Clash? You can vote for Adam Lambert's "Ghost Town" or Britney Spears and Iggy Azalea's "Pretty Girls" once an hour until the polls close at 3PM ET on May 11.

Watch Adam Lambert's "Ghost Town" Video

Listen to Britney Spears + Iggy Azalea's "Pretty Girls"