The 33-year-old star, best known for her role as Fleur Delacour in the Harry Potter film franchise, was attending the premiere of Imperium at the Deaville American Film Festival in France on Friday, when she unveiled her growing baby bump on the red carpet.
Although the Parisian-born actress hadn't revealed the news of her pregnancy herself, a representative for the star has since confirmed the news that she is pregnant to Mail Online.
Clémence was attending the event to support her Harry Potter co-star Daniel Radcliffe, who stars as the lead character in the new film. And the pair looked absolutely delighted to be reunited, posing and laughing together in front of the cameras.
The actress is extremely private, telling the Evening Standard when asked about her love life that 'I never talk about it at all', although it was recently reported that she'd split from her fiancé Emeric Glayse.
The star, who's also appeared in Gossip Girl and the film In Bruges alongside Colin Farell, turned to acting after she was bullied at secondary school.
When speaking to YOU magazine about her rise to fame, Clémence said: 'I wanted to do something else, just for myself.
'So at the age of 16 I called an agent without telling my parents and decided that I'd act during the holidays and after school.
'I knew acting was a lot of hard work and very difficult. But I also knew it was a possibility.'
It seems the actress had no idea just how popular her role in the Harry Potter films would turn out to be. Speaking to the Telegraph, she said: 'I had no idea how much Potter would change things, but it did.'
She also accredited her independent, confident nature to her mother. 'She always gave us her trust. She was very good at telling us when we were doing something right, as well as when we were doing something wrong.'
No other details of the star's pregnancy have been revealed, although according to one source it's said that she's due in October.