Celebrity singers (hints are their songs)

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Across
  1. 1. Birds of a feather/Bad Guy
  2. 3. Espresso/Nonsense
  3. 5. Umbrella/Diamonds
  4. 6. All I want for Christmas
Down
  1. 1. Toxic/baby one more time
  2. 2. Baby/mistletoe
  3. 3. Wolves/People you Know
  4. 4. Cruel Summer/Shake it Off