Celebrity baby names: Yves
The name is a family one - Yves, French for 'yew wood', is the name of Sylvain's brother, while Joseph is a tribute to Samia's dad.
Samia took to Twitter to express her happiness, writing: '@slongchambon and I are so happy and in love beyond words with our beautiful boy.'
Samia also has a daughter, Freya, from a previous relationship.
- Best potties: Which is the best potty for toilet training?
- Top Christmas toys 2017
- Hidden sugar in kids foods: What's in your child's favourites?
- Top kids' toys for 2017
- Free knitting patterns
- The royals as babies
- Royal baby traditions
- Celebrities with twins
- Creative play: Christmas gift ideas that encourage imaginative play