LOS ANGELES — Ariana Grande has filled in for a hologram version of Whitney Houston in a duet with Christina Aguilera on the season finale of NBC's "The Voice." Grande's performance comes days after the planned hologram appearance of Houston was scrapped due to technical reasons. The late singer's family said last week the hologram fell short of perfection and shouldn't air. Instead, Grande joined Aguilera, one of show's celebrity coaches, in singing the title track off ......
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