Hailey and Justin Bieber

The 28-year-old Rhode Beauty founder and the 30-year-old pop megastar confirmed the arrival of their first child, son Jack Blues, in August.

Hailey didn't announce their big news until she was six months pregnant and admitted she probably could have kept it a secret "till the end" because of a her tiny bump - but it was too stressful.

She told W magazine: "I probably could have hid it until the end. But I didn’t enjoy the stress of not being able to enjoy my pregnancy outwardly. I felt like I was hiding this big secret, and it didn’t feel good. I wanted the freedom to go out and live my life."