Olivia Munn stopped by David Letterman's NYC studios, but before she headed inside, she posed in her cobalt racerback Raquel Allegra dress ($295) that's sexy up top and ladylike on bottom. The actress cinched her waist with a matching belt for definition and prettied her feet via chunky wooden platform ankle-strap sandals. Longer-hemlined dresses are all the rage these days, but we love that Olivia's choice maintained a bit of sass thanks to the scooped bodice. Re-create Olivia's latest look by shopping this similar cobalt high-low dress from Express ($60) and pairing it with equally chunky platform sandals. Then swap out the heels for flat sandals for a breezy city stroll.