The "Umbrella" singer is belting out another tune these days: "It's easy, breezy, beautiful CoverGirl." In her inaugural ads for the new beauty campaign, Rihanna touts a mean pout with CG's Wetslicks Fruit Spritzers lipgloss. But she admitted to PEOPLE that her must have product is, "Concealer. It is so important for under the eyes because it just wakes you up." As a tomboy in her younger days, Rihanna, 19, was not allowed to wear makeup. "I would sneak and ...