6. Demi Lovato
Demi Lovato has become a pop superstar and would add in a completely different, more modern element to Coldplay's performance. A mashup of "Paradise" and "Confident" could be incredible. When it comes to halftime performances, the ones that mesh and compliment the main act have been able to stand the test of time, Lovato would be the perfect compliment to Coldplay with her brand new, confident sound.
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