Katy Perry and Jessica Alba turn up the heat with skin-baring looks: PHOTOS

Katy Perry walked the red carpet at the 11th Breakthrough Prize Ceremony in a futuristic sequined Gaurav Gupta gown, held together with sheer mesh fabric, which is not only backless, but also features a large cutout on the chest which goes all the way down to her hip.

The former "American Idol" judge wore her hair in a short bob with the front pieces styled in a wet look. She wore a sequined headpiece, matching the material of the dress, which covered her hair and neck.

She kept the rest of her accessories to a minimum...