Sia, of course, appeared with her face covered as she's been known to want to keep her privacy, but it didn't take away from the AH-Mazing performance she gave!
As per usual, Julianne and Derek were both absolutely incredible and we wouldn't expect anything less! The Houghs had a little help from mini versions of themselves that they paralleled on stage next to them.
Sia's song was a hauntingly beautiful soundtrack to each pair's struggles they showed through their interpretive dance.
Ch-ch-check out the amazing performance for yourself (above)!
So, in a matter of speaking, James and Chrissie are covering a cover!
James told us EXCLUSIVELY of their collaboration:
As soon as I met Chrissie, I knew I wanted to collaborate with her! She is an incredibly kind and talented girl, and putting together this cover was nothing but fun! She suggested Flashlight by Jesse J, which is a beautiful song that is largely featured in Chrissie's new movie, Pitch Perfect 2. It was also written by two of my favorite artists, Sia and Sam Smith, so for me this was a no brainer. I just hope everyone likes our rendition!
Ch-ch-check out their version above! Is it aca-amazing? Perhaps James can appear in Pitch Perfect 3!
The sibling rivalry came to a head when in order to take down Derek's hot take on Macklemore's Can't Hold Us, she totally pulled out a secret weapon — the real Meghan Trainor came out to help her sync All About That Bass!