The Duchess of Cambridge will present the BBC's Sports Personality of the Year award and the lifetime achievement honour tonight, St. James's Palace said.
Catherine has not been seen in public since leaving the King Edward VII's Hospital in London on December 6.
She received three days of treatment for a condition known as hyperemesis gravidarum, which leaves expectant mothers so ill they cannot keep food or liquids down.
More top news
Imposing age ratings on music videos is a step in the right direction but it's currently impossible to police endless inappropriate content.
A body has been found in Ireland in the search for one of the so-called Disappeared, 23-year-old Brendan Megraw killed in 1978.
The position, posted on the British Monarchy website, pays £16,000 a year for 20 hours a week.