The princes set up the foundation in 2009 to focus on charitable causes important to them, and it led to the establishment of The Invictus Games and mental health initiative, Heads Together.
The Duke and Duchess of Sussex sent well-wishes to William, Harry's elder brother and the Duke of Cambridge, on his 37th birthday Friday.
Harry, Meghan, Kate and William at the first Royal Foundation Forum in February 2018.
The Fab four are no more.
"The Duke and Duchess of Cambridge and The Duke and Duchess of Sussex are incredibly proud of what they have achieved together through the Royal Foundation", it said. "They are especially proud to have established a charity that has had, and will continue to have, significant long-lasting impact, changing lives for the better".
Both episodes, to be shown tomorrow night, include a feature entitled "Meghan Markle's Royal Sparkle".
Levin also said that there's been talk that William had told Harry he was rushing things with Meghan, which Harry "took very badly" - a rumor that's circulated for some time now.
Ever since Meghan and Harry moved into their new home Frogmore Cottage earlier this years, rumours of a rift between the two couples - and specifically William and Harry - have been circulating.
During the Q&A, they were quizzed on whether there were disagreements, with William replying "Oh yes", while Harry said "healthy disagreements" adding he couldn't remember if they had all been resolved as they "come so thick and fast". Their baby boy was second in line to the throne from the moment of birth and guaranteed a new line of succession. This means the Cambridges are more constitutionally constrained than the Sussexes.
There also have been hints that Meghan might spend some time in the United States with or without Harry. A name has not yet been chosen for the new foundation.