The Oscar nominee, 32, made her first public appearance since giving birth at a cast dinner for her new film "Mudbound" at the Toronto International Film Festival on Monday. She covered up her post-baby body in a long, navy dress and a black Chanel belt, reports usmagazine.com.
Mulligan and Mumford have yet to confirm the baby news.
In fact, the couple -- who also share two-year-old daughter Evelyn Grace -- never officially announced the British actress' second pregnancy, though she did show off a very noticeable baby bump during a dinner date in London in June.
"They have been loving being parents and their friends and family are thrilled," a source had said after the pair welcomed their firstborn in 2015.
Mulligan and Mumford got married in 2012. They were childhood pen pals before their friendship turned romantic in 2011.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)