The 36-year-old actress, known for films including St Trinian’s and Quantum Of Solace, was all smiles as she posed at Covent Garden’s Middle Eight and cradled her stomach for the cameras.
Arterton, who was the recipient of the Icon Award at the annual London event, previously spoke about her plans to have children.
“I won’t have children until I’ve done something of which I’m proud,” she told the Times in 2013.
“I don’t feel ready for kids because I want to know that I can come back and still be valuable to the industry.
“That’s only going to happen when I feel a little bit more accomplished.”
Arterton was married to fashion consultant Stefano Catelli for four years. They divorced in 2014.
In 2019, she married current husband, Irish actor Rory Keenan.
The pair have not put out a statement about the pregnancy.
Arteton began her career on stage before making her feature film debut in 2007 in the reboot of St Trinian’s, in which she played Kelly Jones — the resourceful head girl at the infamous school.
She went on to portray Bond girl Strawberry Fields in the James Bond film Quantum Of Solace and was later nominated for Olivier Awards for her work in musicals Nell Gwynn and Made In Dagenham.