Mila Kunis is on a roll. Thanks to her saucy turn as bad-girl temptress Lily in Black Swan, the former That ’70s Show star has become an A-list box-office draw. Now she takes center stage in Friends with Benefits, the story of Jamie (Kunis) and Dylan (Justin Timberlake), two best buds who are convinced they can make a purely physical relationship work. (We’ll let you guess what happens next.) Here, America’s new sweetheart, 27, speaks about her complicated character and love affair with mac and cheese.