Miranda Kerr is striking a new pose: mom of four. After all, the supermodel announced Feb. 27 that she and husband Evan Spiegel welcomed their third baby, a son named Pierre Kerr Spiegel.

Let's play guess the celeb baby bump! It is Mother's Day after all ...

Miranda Kerr's youngest son was named after her late ... "And when you're having a new baby coming into the home, you often wonder, you're like: ‘Oh, how are the boys going to react?’ ...

Miranda Kerr/Instagram “He's just a little ray of sunshine and his brothers just adore him,” she tells PEOPLE. “And when you're having a new baby coming into the home, you often wonder ...

Miranda Kerr Shares Why Bed Rest in Previous Pregnancies Gave Her Pause About Having Fourth Baby Why Pregnant Miranda Kerr Starts Every Day at 5 a.m. (or Earlier!) as a Working Mom of 3 ...