Katy Perry has announced that she helped to deliver a baby rumoured to be her older sister Angela's newborn.

The Dark Horses singer told her Twitter followers, "Finally you can add "helps delivers babies in living rooms" to my resume! It's been a miracle of a day... Auntie Katy aka Stylist Auntie"

While Perry did not reveal the identity of the mother, E! News have reported that it's possibly her older sister Angela Hudson's baby as she revealed she was pregnant last year.