Wright, 47, wore a ring on that finger to Diane von Furstenberg's "Journey of a Dress" exhibition Friday night in Los Angeles, and on Saturday her rep confirmed to People that yes, she was indeed set to wed again.
She and Foster, 33, who met on the set of the 2011 film "Rampart," were outed as a couple in February 2012.
Wright herself confirmed the engagement to E! News at a Golden Globes after-party, calling her younger beau "the hottest" and noting, "I'm very blessed, a lot of gratitude."
The "Princess Bride" and "Forrest Gump" star for years was known as Robin Wright Penn, when she was married to actor