Who is Shelly's Secret Santa?

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Across
  1. 1. outside singers
  2. 3. built with snow
  3. 5. birthplace
  4. 7. sheep tenders
  5. 10. among gifts received
  6. 13. informant
  7. 14. 3 travelers
  8. 15. secret Santa's helper
Down
  1. 1. king's birthday
  2. 2. give and receive
  3. 4. star showed where
  4. 6. dreaded gift
  5. 8. holiday drink
  6. 9. heavenly beings
  7. 11. never leaves
  8. 12. elf
  9. 13. lit