From Jimmy and Justin busting a move at the U.S. Open to Biebs flashing some abs, here's what some of your favorite stars were up to this week.

  • Bob Levey/Getty
    Bob Levey/Getty
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    1

    Taylor Swift & Wiz Khalifa

    TSwizz and Wiz collabo'ed up in Houston, Texas where the rap star hit the stage for the 1989 Tour stop.

  • Getty/NBC
    Getty/NBC
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    2

    Justin Bieber

    The pop star continued his return to the music scene and reminded us he's still ab-tastic while performing outdoors in New York on The Today Show.

  • Getty Images
    Getty Images
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    3

    Jimmy Fallon & Justin Timberlake

    The pals break into some 'Single Ladies' while caught on camera at the U.S. Open tennis tournament in Flushing Meadows, New York.

  • Vivien Killilea/Getty Images
    Vivien Killilea/Getty Images
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    4

    Lauren Conrad & Chrissy Teigen

    The former reality star-turned-fashion designer gets some support from model Teigen while debuting her Spring 2016 line for Kohl's during New York Fashion Week.

  • Kevin Mazur/Getty
    Kevin Mazur/Getty
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    5

    Madonna

    The Material Girl returns to the stage for the opening night of her Rebel Heart Tour in Montreal, Canada.

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