The very cool Olivier Rousteing took the helm as head designer at Parisian fashion house Balmain at the age of 25 years old and in the two years he's been there—do the math: he's still only 27!—he's blown in a fresh, of-his-generation breath of fresh air. Case in point his selection of Rihanna to model Balmain's spring collection in a new ad campaign shot by Inez and Vinoodh. Rousteing and Ri Ri have been flirting on Instagram for a couple months now, and she's perfect to model the kind of over the top '80s clothes that Rousteing has a knack for, styles like broad-shouldered dresses and gaudy gold that he might remember from his toddler years in the late part of that decade.