Celeb Tracker: The 5 Best Photos of the Week

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
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
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
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
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
5
Madonna
The Material Girl returns to the stage for the opening night of her Rebel Heart Tour in Montreal, Canada.