Just hours after announcing her engagement to Ryan Reynolds, Scarlett Johansson was flashing her new diamond ring around the Metropolitan Museum of Art's Costume Institute Gala. Reynolds and Johansson have not yet set a wedding date.

Johansson, 23, unveiled the sparkler while walking the red carpet at Monday night's celebrity-filled event. Also in attendance were Julia Roberts, George Clooney, Tom Cruise and Katie Holmes.

Johansson showed off her curves in a gown designed by Dolce and Gabbana, while the real-life designers stood by her side. Johansson and Reynolds had announced their engagement earlier in the day.

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