ISLAMABAD – She is one of the hottest singers in Hollywood.And Katy Perry sent temperatures soaring as she worked a skintight leather red dress for Instagram followers recently. The I Kissed A Girl songstress, 36, shared snaps of herself posing in between American Idol takes, where she looked ravishing in the crimson frock with thigh-high PVC boots.The plunging number clung to Katy’s wait and flashed a hint of leg as she posed for the camera with her hands upon her svelte torso. The Roar singer looked fierce with her blonde hair styled into a sleek ‘do that framed her exquisitely done makeup. Long full lashes brought out her blue eyes while a tint of lipstick added to the red hot vibe.In the final pose of the slideshow, she squatted towards the floor with one hand resting upon her knee. The stakes were high on recent episode of American Idol, but Katy still managed to inject a bit of humor as she judged the crop of contestants.