"Our hearts go out to the families and friends of the people who lost their lives in the devastating attack in Christchurch."
The actress is recovering after suffering a ruptured ovarian cyst.
William also thanked the RAF troops for their sacrifices.
Kate and William met Vichai Srivaddhanaprabha's family during a poignant walkabout.
There was even a biscuit joke.
The Queen passed on her duties to her son Prince Charles for a second year in a row.