Pop singers

12345678
Across
  1. 3. twin pop singers
  2. 4. 16 years old,and sings royals
  3. 6. she had a disturbing performance at the grammys
  4. 8. who sang roar?
Down
  1. 1. he sang at the 2012 super bowl
  2. 2. has the new album "red"
  3. 5. the 2012 hit, thriftshop
  4. 7. on the 2013 voice as a judge - ce ** *****