Ariana Grande went all out for her performance at Z100's Jingle Ball concert in NYC on Friday, donning a sparkling antler headpiece that matched her microphone. In other fun moments, Zac Efron's biceps were on display, Tom Cruise gave us Risky Business flashbacks, and Paris Hilton and Lenny Kravitz showed skin on the red carpet. Keep reading to see all that and more, and be sure to come back later as the weekend continues.
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