Scarlett Johansson shows off engagement ring

updated 2:26 p.m. ET May 6, 2008

LOS ANGELES - Scarlett Johansson and her boyfriend, Ryan Reynolds, are engaged.

The 23-year-old actress and the 31-year-old actor have not set a wedding date, Johansson’s publicist, Marcel Pariseau, said Monday.

Hours after confirming her engagement, Johansson flashed a diamond ring at the Metropolitan Museum of Art’s Costume Institute Gala.

The 23-year-old actress unveiled the sparkler while walking the red carpet — sans Reynolds — at Monday night’s celeb-studded event, which drew the likes of Julia Roberts, George Clooney, Tom Cruise and Katie Holmes.

Johansson, flanked by Domenico Dolce and Stefano Gabbana, posed for the cameras in a cream gown by the designers that showed off her curves.

The couple reportedly had been dating for more than a year. Their relationship status was speculated about in gossip columns and tabloids, which published paparazzi shots of the pair.

When rumors began swirling in early ’08 that Reynolds had proposed, Johansson deflected a question by The Associated Press with a joke about her affection for presidential hopeful Barack Obama: “My heart belongs to Barack, and that is who I am currently, finally, engaged to. Yes.”

Johansson’s recent credits include “The Other Boleyn Girl” and “The Nanny Diaries.” Reynolds recently starred in “Definitely, Maybe.” He was previously engaged to Alanis Morissette.

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