Yaass! Ariana and Chris gave the Harry penned tune "Just A Little Bit of Your Heart" the absolute voice of a thousand angels treatment because...yeah...goosebumps.
Ariana was a surprise guest at the concert, with Chris introducing her as "more good looking" than him, and explaining she was his kids pick for the event. He even slipped in a cute joke about almost wearing the same outfit as Ari, while she waved to the crowd.
Before launching into the song, Chris explained it was "written by the handsomest man in the world, Harry Styles." How cute is that?
Watch Ariana and Chris' duet of "Just A Little Bit Of Your Heart," which they only rehearsed for the first time earlier in the day.
After, Ariana tweeted: "thank you @coldplay <3 it was an honor to say the least."