In view of her 518,000 Instagram followers, Tess penned a lengthy message as she revealed the charity will always have a “special place in my heart”.
The Strictly Come Dancing host penned: “For the past 11 years I’ve had the great privilege of presenting Children In Need alongside brilliant presenters and an amazing team.
“Pudsey and what he represents will always hold a special place in my heart but it’s time to pass the presenting baton over as the show reaches it’s amazing 40-year milestone.”
Tess continued: “That’s four decades of the British public donating and heroically fundraising over £1bn towards changing children’s lives for the better.
Tess joined the presenting lineup in 2008 and has presented alongside a host of famous faces including Peter Andre, Nick Grimshaw and Zoe Ball.
Meanwhile, the presenter is due to make a return to BBC in October as she gears up to present Strictly Come Dancing 2020 alongside Claudia Winkleman.
They will include famous faces including Good Morning Britain’s Ranvir Singh and boxer Nicola Adams.
Elsewhere, the BBC presenter jetted off on a mini-break to Copenhagen with her husband of 17 years, Vernon Kay, 46, and their two daughters, Amber, 11, and Phoebe, 15, before the anticipated return to work and school.
The BBC presenter recently opened up about their “fabulous” time away via Instagram.
Tess shared three photos of their trip to the “beautiful” city, including one of herself and Vernon, a selfie, and a snap of a stunning flower stall.
She penned: “Squeezed in a mini-break to Copenhagen before it’s back to school/work.
“Felt such a treat, it’s a beautiful city; the friendliest laid-back people, fabulous super healthy food and the kids loved that EVERYONE bikes everywhere,” she shared.
“Not surprised it’s been voted the world’s happiest country.”