According to the publication, the intimate ceremony only included immediate family and close friends of 43-year-old Stefanovic and Yarbrough, 34.
A commitment ceremony typically involves the exchange of vows and rings, but it is not necessarily legally binding.
The Sydney Morning Herald reports that, while Karl's youngest children Ava, 13, and River, 11, attended the ceremony, his eldest song Jackson, 18, was not in attendance. Karl shares his children with his ex-wife of 21 years, Cassandra Thornburn.
The newlyweds are yet to share any snaps from the big day, but stay tuned!