Hailey Bieber is LOVING life as baby Jack's mom, but this new phase of her life also comes with a ton of new anxiety! In Tuesday's new edition of Interview, the model broke down the best - and scariest - parts of being a mother. (c) Justin Bieber/Hailey Bieber/Instagram On the most "exciting" aspects of raising her first child, she shared: "Just seeing this little human evolve before your eyes. They grow so fast and they change so much and there's always so much excitement.