Amanda Holden will take Holly Willoughby's place on the This Morning sofa while she goes on maternity leave.
The Britain's Got Talent judge will join co-host Phillip Schofield on the show for four days a week from September, with Willoughby's third child due in October.
"I'm over the moon to get the chance to present one of my favourite shows on TV and I'm thrilled to be keeping Holly's seat on the sofa warm when she goes off on maternity leave," Holden said.
"I have always been a huge fan of This Morning and love presenting with Phillip so I really can't wait to get started."
ITV Daytime managing executive producer Emma Gormley said Holden's warmth and charisma would be a hit with viewers.
TV star Holly Willoughby says she is determined to keep working until the moment she goes into labour with her third child.
Ms Willoughby, who is best known for co-presenting flagship show This Morning told The Sunday Mirror's Notebook magazine: "It's so hard to know when I'm going to go into labour. I'm just going to keep working until one day I don't come back in again. That's what I've done before."
The 33-year-old, whose due date is in October, said she was speedily trying to wrap up filming for ITV's new series of Surprise Surprise before the baby arrives.
"My job is sat on a sofa. I'm sitting down all the time on This Morning, and on Celebrity Juice I'm behind a desk. So don't feel too sorry for me," the TV presenter said.
This Morning and Surprise Surprise host Holly Willoughby has announced she is expecting a third child with her husband Dan Baldwin.
The 33-year-old posted a message on her website, saying: "Surprise Surprise (and it was a surprise!!) I'm really happy and excited to tell you that Dan and I are expecting baby number 3!!
"We feel blessed and very lucky to be giving Belle and Harry a little brother or sister later this year."
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This Morning has been named best daytime show at the National Television Awards for the fourth year in a row.
Accepting the award Phillip Schofield said: "This is a real shock for us actually, four in a row is unbelievable. Thank you so much to the This Morning viewers who are such a loyal family."
Watch the National Television Awards live on ITV
This Morning is marking its 25th anniversary with a return to where the show began - Liverpool's Albert Docks.Read the full story ›
This Morning is urging people to Take a Moment and perform a small meaningful act of kindness as part of its 25th anniversary celebrations.Read the full story ›
Apprentice star Katie Hopkins has defended her comments over linking children's names to class after an explosive interview on This Morning.Read the full story ›
ITV's This Morning are launching 'You Can Be Heroes' week with the help of the Prince of Wales.
After last year's successful Olympic and Paralympic Games, the prince hopes that the public can maintain and build on the goodwill and enthusiasm generated by Games-makers and volunteers.
He said: "A lot of people don’t realise how so many of these people keep the whole show on the road. There is something remarkable in this country I think, about the volunteering spirit.”
Prince Charles also spoke about other, more personal areas of his life, such as not wanting to hand on "increasingly dysfunctional world" to his and every, grandchild.
He also spoke of his fears for Prince Harry, who is currently serving in Afghanistan:
"Certainly every night I worry. But he loves doing what he’s doing and he’s brilliant at it.”
The full interview with the Prince of Wales will be broadcast on Monday 7th January
X Factor winner James Arthur told ITV1's This Morning that he has "a lot to say" on his upcoming album and promised fans that he will have creative control over his work.
"I will definitely be having control over everything that happens, I will have creative control and the artistic license - if that's not the case, then I wouldn't put anything out that I didn't believe in."