"Oh no!" the Prada-clad Les Miserables star, 31, exclaimed in sympathy, seeing Stewart's crutch.
"I know, I'm an idiot," Stewart (stunning in a Reem Acra gown, Jimmy Choo heels and Fred Leighton jewelry) replied. "But congratulations!" she said, eyeing Hathaway's hard-earned Oscar.
"Please tell me you're going on stage with those [crutches]," Hathaway said, the AP reports. "Nope," Stewart replied. "I'm gonna hobble."
Quipped the "I Dreamed a Dream" singer: "Well, break a leg . . . Oops!" Stewart then explained that she cut her foot recently after stepping on glass. "I just hope [the wound] doesn't open up right now."