This is Rebekah Hawker, a solo artist from Ontario. She's best known for her original song Girl On Fire, a tribute to the second installment of the Hunger Games trilogy.
She recently uploaded the following video, which is an awesome mashup of Lulu & the Lampshades' Cups, Robyn's Call Your Girlfriend, and La Roux's Bulletproof.
You can follow her on YouTube or Soundcloud.