You might say the 40-year-old Britain's Got Talent judge was over the balloon as she revelled in the pink-themed celebration at London's Soho Hotel.
Carrying balloons and a yellow box, Amanda hopped into a waiting car which had a boot full of presents.
Despite being around seven months pregnant, Amanda still looked tiny, her bump barely visible in a black lace dress and stockings.
She tweeted a picture of her standing next to a tray of cupcakes and holding gifts at the shower with the message: "My lovely girls just thru me a surprise Baby shower!Very happy! Full of pink, cupcakes and pressies!"
Did you have a baby shower?