It's a baby boy for Karen O!

The Yeah Yeah Yeahs singer Karen O has become mum to a baby boy, announcing the news with this gorgeous photo of her newborn son she posted to her Instagram.

She is married to director Barnaby Clay who shot the band's video for 'Zero', and this is their first child.

She released her debut solo album 'Crush Songs' in September last year and only recently announced her pregnancy.

The post introducing her baby boy to the world was captioned with the lyrics of Roberta Flack's 'The First Time Ever I Saw Your Face.'

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