Amanda posted the gorgeous shot of her new arrival on stage at the Theatre Royal on her Twitter page.
The glowing new mum posted the photo with the message: "Hollie on stage at Theatre Royal Drury Lane - out of my tummy!!"
It's been a busy week for the Britain's Got Talent star, who not only returned to the judging panel on the hit TV show, but also celebrated her birthday.
"Thank you for your Birthday wishes! Been very spoilt. I am officially 41 today- but decided to stay 40! as 2011 was blinkin rubbish... x" she told her 941,389 Twitter followers.