Jessie J displays her taut midriff and lithe legs in crop-top and underwear

Kylie Jenner flashes abs in tie-dye rainbow crop top, before game night with her best friend Stassie

Kym Marsh, 44, showcases her washboard abs as she poses in a black crop top and leggings

Bella Thorne beats the heat skin in Chanel crop top and Daisy Dukes for retail therapy in Calabasas