Constance Wu was surprised when she found out she was having a boy (Picture: Axelle/Bauer-Griffin/FilmMagic)

It’s a boy! Constance Wu has welcomed her second child with boyfriend Ryan Kattner.

The 41-year-old actress – who also has a two-year-old daughterwith her partner – has revealed that she’s given birth to their second child and admitted ‘nobody knew’.

In a teaser clip for the PRETTYSMART podcast, which will be released in full Constance said: ‘Breaking news. Nobody knew I had a son.’

The actress, who revealed her pregnancy on social media in February, opened up about her arrival after explaining that she’d dedicated her book to her daughter, noting she wrote it before the arrival of her baby boy.

‘They were like: “You’re having a boy,” ‘ the Crazy Rich Asians star said as she recalled finding out they were having a son.

Mimicking her surprised reaction, she added: ‘And I was like: “Are you sure?”‘

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And she explained that despite ‘differences’ between raising a son and a daughter, she hasn’t been nervous about her new bundle of joy.