Celeb Tracker: The 5 Best Photos of the Week

From Taylor's Frozen duet in Tampa to JLo's skeletal Halloween, here's what some of your favorite stars were up to this week.

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1
Alicia Keys
The singer is all smiles at the finish line of the New York City Marathon.
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2
Taylor Swift & Idina Menzel
The singers join forces during Swift's 1989 Tour stop in Tampa, Florida where the greeted the crowd with a double-sized version of Frozen's 'Let It Go'.
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3
Liev Schrieber & Naomi Campbell
The married actors treat their sons Kai and Sasha to a screening of The Peanuts Movie.
Mike Coppola/Getty
4
Jennifer Lopez
It's a trio of sympatico costumes for Nicole Sherzinger (left), Casper Smart, (center) and Jennifer Lopez at Heidi Klum's annual star-studded Halloween party.
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5
Selena Gomez & Amy Schumer
The singer and comedienne sneak in some girl time during the Hollywood Film Awards.