Must-See Celeb Sightings: December 9-17, 2019

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Mariah Carey lights the Empire State Building in celebration of the 25th anniversary of "All I Want For Christmas Is You"
Dia Dipasupil/Getty Images

From Hollywood to New York City, celebrities are living their best lives on both coasts and everywhere in between. Click through the gallery to see some of the best and hottest events this holiday season.