The aesthetically-pleasing pair are expecting their second child together. The 36-year-old shares son Flynn, eight, with ex-husband Orlando Bloom, 42, and also has Hart, her one-year-old son with husband Evan.
Despite their split, Orlando and Miranda are great friends with the model also becoming close with Orlando's fiancee Katy Perry.
The supermodel confirmed her pregnancy with Snapchat CEO Spiegel in March, 10 months after giving birth to their first child.
Kerr and Spiegel celebrated their second wedding anniversary on May 27 having welcomed son Hart on May 7 last year.
The couple, who are notoriously private about their family life, are yet to release photos of their first child, who hasn’t been seen publicly.
The soon-to-be mum-of-three appeared on Seven’s Sunrise on June 26 and spoke about balancing her successful business with being a mum.
“It is a lot of work and it takes a lot of planning and preparation, but, you know, I say it’s organized chaos,” she said.
“Things don’t always go to plan and obviously the kids are my priority, but I do the best I can, trying to schedule things around their nap times or play dates and around their school schedule – it’s all a balance.”