The 40-year-old British star gave a telling smile as she posed at the premiere of her new film, Half Of A Yellow Sun. As her proud partner put a protective arm around her, Thandie looked utterly radiant as she posed in a monochrome Stella McCartney dress – the tiniest hint of a baby bump just about visible.
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Thandie and writer-director OI have been married for 15 years, and are already parents to daughters Ripley, 13 this month, and Nico, eight.
"She couldn't be more happy," a source told US Weekly. "You can barely tell she has a bump and she's been dressing different because of it."
Half Of A Yellow Sun is based on a novel by Nigerian author Chimamanda Ngozi Adichie and follows four people during the struggle to establish an independent republic in Nigeria.
Also attending the Toronto premiere was leading man, Chiwetel Ejiofor, who stars in one of the festival's most talked about films, 12 Years A Slave.
Seeing the project finally unveiled must have meant a great deal to the British actor; his family were directly affected by the Biafran War, with the conflict prompting parents to flee the country and emigrate to London.
Thandie and Chiwetel's co-star Anika Noni Rose was also at the screening.