Irwin has been very open about her pregnancy, as she had been about dating and marrying Chandler Powell.
Dunham was in a five-year relationship with Jack Antonoff, which ended in December 2017.
Miley Cyrus, 28, was first romantically linked to Simpson in October 2019.
The new parents are yet to share any pictures of their daughter on social media.
The couple is, however, engaged in a custody battle of their 12-year-old twin daughters Harper Vivienne Ann and Finley Aaron Love.
Here, in this article, you can learn more about some celebrities who didn’t like studying at university, and yet, they managed to become successful and famous.