Today host Lisa Wilkinson shared a photo of the moment the couple tied the knot: "The beautiful moment @sylviajeffreys & @peter_stefanovic became man and wife. So much joy! #happilyeverafter".
Jeffrey's white gown is believed to be a Rebecca Vallance design.
Those in attendance at the wedding include older brother Karl Stefanovic and fellow Today Show presenters Richard Wilkins and Tim Gilbert.
Jeffreys and Stefanovic first confirmed their relationship in 2014.