The presenting couple have become parents for the first time.
Love Island's Iain Stirling and Laura Whitmore led the tributes a year on from Caroline's death.
The last two series of the ITV2 reality show were cancelled due to the Covid situation.
"It’s been hard to keep such happy news quiet," the presenter wrote on Instagram.
Love Island's Laura Whitmore and Iain Stirling and Radio 2's Zoe Ball are among those joining the Channel 4 show.
There have been conflicting reports in the last few weeks about whether the ITV2 dating show would air this year.
The Love Island star said she "just wanted to dance", but there were many other responsibilities that came with the BBC show.
"There are so many things that would be said about Caroline that you wouldn’t take everything as truth," the Love Island presenter said.
As Fern Britton and Laura Whitmore prove, not every celebrity has the best time with their professional partner on the BBC dance show.
The couple shared the £50,000 prize in Sunday’s live final.