The news comes 10 months after the couple welcomed son Hart. Kerr is also mum to 8-year-old son Flynn with her ex-husband, Orlando Bloom.
"Miranda, Evan, Flynn and Hart are looking forward to welcoming the newest member to their family," Kerr's rep The Daily Telegraph.
Kerr recently opened up about family to InStyle Australia.
"My team understands that my family comes first—I’m going to come into the office after I drop my son to school, [or] do a conference call when my little baby is napping," Kerr said. "When people know what to expect, you can manage those expectations. It’s also important that my kids see that I’m a working mum and I have my own business and that their dad has his own business and we both work hard and money doesn’t grow on trees!
"Of course you want to spoil them, [but] that’s how my parents raised me and that’s why I have the work ethic [that I do]."
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