The star's black chiffon dress ... wore a backless white pantsuit with minimal jewelry. The two stars looked stunning as they posed for a selfie. Ariana took to social media to share a glimpse ...

NEW YORK (AP) — Ariana Grande did her Glinda proud in ... semi-formalwear since black tie is a notch below white tie, they often go a little too far and too wacky,” Guy said.