LOS ANGELES, Jan. 26 (UPI) -- Keira Knightley appears to be pregnant with a baby girl.
The 29-year-old actress let the news slip while discussing her dress with E! News at the 21st annual Screen Actors Guild awards Sunday. Knightley and husband James Righton have been married since May 2013, and announced they are expecting their first child in December.
"It's boiling out here," she admitted on the red carpet. "[Pregnancy] just means you're not going to wear anything tight. Some people do wear tight things ... I don't want to go for that."
"So it's all quite loose," she said of her eggplant-colored lace dress with sheer detail. "I'm quite comfortable, she's quite comfortable."
Knightley was nominated for Oustanding Performance by a Female Actor in a Supporting Role for her portrayal of Joan Clarke in The Imitation Game, but lost to Patricia Arquette in Boyhood. She and her co-stars were also up for Outstanding Performance by a Cast in a Motion Picture, but lost to Birdman.
Knightley will next appear as Jan Hall in Baltasar Kormakur film Everest. The movie dramatizes the 1996 Mount Everest disaster that led to the deaths of eight climbers, and co-stars Jake Gyllenhaal, Josh Brolin, Robin Wright and Sam Worthington.