Spoiler alert: she wasn't at the gym.
Selena Gomez wore a sports bra as a top.
Puma X Selena Gomez Sport Bra In Blue
Medium supportRacerback design with cut-outsHook fasteningMesh overlayTight fitMaterial composition: 77% Polyester, 23% Elastane Size shown: Small
Women's x Selena Gomez Sports Bra
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Selena Gomez flashes her toned abs in a red sports bra and sheer
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Selena Gomez Wore A Black Puma Sports Bra While Working, 41% OFF