Rumer Willis stands out from the crowd as she flashes her abs in tiny orange crop top

MAFS' Jessika Power flaunts her figure as she goes braless in a hot pink crop top

Alessandra Ambrosio flaunts her toned tummy in a crop top and jeans for a casual lunch with friends

Amelia Hamlin, 19, goes braless and flashes her taut waist in a tiny crop-top and sweat pants