The newly engaged star shows off a diamond sparkler at the Met's Costume Institute Gala in N.Y.C. Plus: Mariah Carey, Ashton & Demi, Clive Owen and more

JUST ENGAGED!

Newly engaged to Ryan Reynolds, a glowing Scarlett Johansson shows off a sparkling diamond ring while posing – in an ivory Dolce & Gabbana dress – with designers Domenico Dolce and Stefano Gabbana at the Metropolitan Museum of Art's Costume Institute Gala in New York City.