From a friendly game of Flip Cup between Jimmy Fallon and Amy Adams to the cast of Night at the Museum getting crazy on the red carpet, here's what some of your favorite stars were up to this week.

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    1

    Mariah Carey

    The diva is joined by a group of young fans during her holiday concert at Beacon Theater in NYC.

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    2

    The sisters reunite at a fashion event.

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    3

    Amy Adams and Jimmy Fallon

    The actress is a good sport losing to The Tonight Show host during Holiday Flip Cup.

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    4

    Miranda Lambert, Reba McIntyre, Kelly Clarkson

    The singers unite and bring down the house at the American Country Countdown Awards.

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    Courtesy Getty Images
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    5

    The Cast of Night at the Museum: Secret of the Tomb

    Ricky Gervais hams it up at the movie's NY premiere with Rebel Wilson, Ben Stiller

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