The 28-year-old singer, who welcomed her first child in February, also shared the first photograph of her baby, reported Contactmusic.
She posted a close-up picture of her baby girl, with the snap captioned, "Introducing Anaiya".
Coyle had shared the news of her baby's arrival via Twitter itself.
Nadine and Jason first started dating in 2008. It is the second time the couple have been engaged, after the first ended in June 2011.