MEGA Dakota Johnson was given a hard time as photos of her stripped down to nothing but a Calvin Klein bra went viral earlier this year. In March, the actress debuted as the fashion brand’s latest ambassador, with an array of racy photos showing her wearing next to nothing. Alongside posing topless in only a stretchy pair of underpants, Dakota also lounged around poolside in just a bralette with a book over her nether regions, doing similar indo…