Katy Perry has revealed her baby bump on Instagram while modelling her new merchandise - and encouraging fans to stay safe by wearing a mask.The pop star and Orlando Bloom are currently expecting their first child together and in new snaps posted on Instagram, Perry, 35, sported a crop top with the title of her upcoming album, Smile, printed on the front.The three pictures show Perry clad in the top, a rainbow necklace, smiley earrings, and a cap and mask both with “smile” emblazoned on