The Raise Your Glass hitmaker became a mother for the first time after welcoming baby Willow Sage Hart into the world.
She tweeted the news to her fans yesterday, after arriving with husband Carey Hart at Cedars-Sinai hospital in Los Angeles shortly after lunchtime.
The 31-year-old singer wrote: 'We are ecstatic to welcome our new beautiful healthy happy baby girl, Willow Sage Hart. She's gorgeous, just like her daddy. #beyondblessed.'
Mel, 37, who has daughter Scarlet, has since taken to her Twitter page to wish Pink all the best.
She wrote: '@Pink Welcome to the Mummy club. it's the best.'