Britney Spears was poised to enter the Pop Clash Hall of Fame -- until Lady Gaga stepped up for the win! Mother Monster's 'Do What U Want' took the title from the four-time winner's 'Perfume,' and this week she'll face off against Lorde's 'Team.' Who do you think should win: Gaga or Lorde?

Lady Gaga plus R. Kelly equals musical magic. The upbeat track features Gaga's powerful vocals and R's smooth crooning. 'Do What U Want' is all about following desire and living in the moment. Lady Gaga has never shied away from making a statement, even if it's to listen to the heart over the mind. We're obsessed with her Christina Aguilera-tinged notes, which compliment R. Kelly's voice.

Lorde is also living in the moment -- albeit in a city you'll never see on your screen. Continuing the theme of a friendship that prevails above all other things, the New Zealander sings of loyalty as she matures. She may not be living a high-profile life in a big city, but she knows how to have fun.

Whose your pick for this week's Pop Clash? You can vote for Lady Gaga or Lorde once an hour until the polls close at 3PM ET on December 16, 2013.

Listen to Lady Gaga, 'Do What U Want' Feat. R. Kelly Video

Watch the Lorde 'Team' Video