At M·A·C Cosmetics, lipstick is more than a color and foundation is more than cover-up. And now, the essential beauty brand is rolling out its Challenge Accepted campaign inviting consumers to put M·A·C products to the test and shine a light on performance.   Who better to lead the challenging charge than two celebrity superstars Cher and Saweetie? Since September 2021, Saweetie has also been involved with the brand as a spokesperson.   On social media, the influencer campaign will use the h...