Claudia Winkleman will replace Graham Norton as the host of BBC Radio 2's Saturday morning show.
The Strictly Come Dancing co-host, 48, will take over the slot, which broadcasts from Wogan House in London, from February 2021.
Winkleman, who earned about £365,000 in 2019/20, appeared on The Zoe Ball Breakfast Show for the announcement on Monday.
She told Ball she had initially assumed the appointment was "just a massive practical joke" and that she was "really terrified" because there were "enormous shoes to fill".
Norton is joining Virgin Radio as a weekend host next year, following in the footsteps of ex-Radio 2 DJ Chris Evans.
Claudia Winkleman arrives at the Women in Film and Television Awards at The Hilton Hotel in central London.
Claudia Winkleman poses for photographers upon arrival at the British Academy Television Nominees Party in London, Wednesday, 22 April, 2015. (Photo by Joel Ryan/Invision/AP)
Photo by: KGC-211/STAR MAX/IPx 2019 4/29/19 Kris Thykier and Claudia Winkleman at the premiere of Tolkien in London, England.
Claudia Winkleman poses for photographers upon arrival at the Glamour Woman of the Year Awards in London, Tuesday, June 7, 2016. (Photo by Joel Ryan/Invision/AP)
Claudia Winkleman poses for photographers upon arrival at the premiere of the film 'Genius', in London, Thursday, March 30, 2017. (Photo by Vianney Le Caer/Invision/AP)
Claudia Winkleman poses for photographers upon arrival at the Royal Television Society Programme Awards at Grosvenor Hotel in central London, Tuesday, March 17, 2015. (Photo by Joel Ryan/Invision/AP)
Presenters Tess Daly and Claudia Winkleman arrive for the European Premiere of I Give It A Year at a central London cinema in Leicester Square, Thursday, Jan. 24, 2013. (Photo by Joel Ryan/Invision/AP)
Claudia Winkleman and Kris Thykier arrive at the world premiere of iLL Manors on Wednesday May 30, 2012 in London. (Photo by Jon Furniss/Invision/AP)
Claudia Winkleman arrives for the London Evening Standard British Film Awards at City Hall in Westminster, London, Monday, Feb. 6, 2012. (AP Photo/Joel Ryan)
Picture Shows: Claudia Winkleman - (C) BBC - Photographer: David Oldham
EDITORIAL USE ONLY Claudia Winkleman presents the 2020 Kindle Storyteller Awards, via video link at Mount Pleasant Studio in London.
Claudia Winkleman (left) and Tess Daly with the award for best talent show in the Press Room at the National Television Awards 2020 held at the O2 Arena, London. Photo credit should read: Doug Peters/EMPICS
Claudia Winkleman arrives for the Charles Finch x Chanel pre-Bafta dinner, in Mayfair, London.
Claudia Winkleman (left), Stacey Dooley, and Tess Daly (right) with the award for best Talent Show in the Press Room at the National Television Awards 2019 held at the O2 Arena, London. Photo credit should read: Doug Peters/EMPICS
Claudia Winkleman and Nicole Scherzinger attending the 14th BGC Annual Charity Day at Canary Wharf in London, in commemoration of BGC's 658 colleagues and the 61 Eurobrokers employees lost on 9/11.
Claudia Winkleman during the filming of the Graham Norton Show at The London Studios, south London, to be aired on BBC One on Friday evening.
Tom Daley and Claudia Winkleman attend the Team GB Ball at Battersea Evolution in London.
Claudia Winkleman attending the GQ Men of the Year Awards 2016 at the Tate Modern, London. Picture credit should read: Doug Peters/EMPICS Entertainment
Claudia Winkleman attending the House of Fraser BAFTA TV Awards 2016 at the Royal Festival Hall, Southbank, London. PRESS ASSOCIATION Photo. Picture date: Sunday 8th May 2016. See PA Story SHOWBIZ Bafta. Photo credit should read: Jonathan Brady/PA Wire
Claudia Winkleman attends the EE British Academy Film Awards 2015, at the Royal Opera House, Covent Garden - London
Claudia Winkleman at the 2013 Glamour Women of the Year Awards in Berkeley Square, London.
Claudia Winkleman at the gala film screening of Epic, at the Vue West End in Leicester Square, London.
Claudia Winkleman at the 2013 Elle Style Awards at The Savoy Hotel in central London.
Claudia Winkleman attends The Book of Mormon Red Nose Day Gala, the Prince of Wales Theatre, London.
Claudia Winkleman arriving for the 2010 National Movie Awards at the Royal Festival Hall, London.
Claudia Winkleman arriving for the Sony Radio Academy Awards 2010 at the Grosvenor House Hotel, London
Claudia Winkleman and her mother Eve Pollard attend the Harper's Bazaar Women of the Year Awards at The Dorchester in central London.
Claudia Winkleman arriving at The Women in TV and Film Awards 2009, Hilton Hotel, London.
Claudia Winkleman leaving the Glamour Woman of the Year Awards 2009, at Berkeley Square Gardens, W1
Claudia Winkleman and Davina McCall who won Best Host and Digital Spy Legend Awards at the Digital Spy Reality TV Awards at the Bloomsbury Ballroom, in London.
Television presenter Claudia Winkleman at the Digital Spy Reality TV Awards at the Bloomsbury Ballroom, in London.
Claudia Winkleman hosts at the BBC Electric Proms 2008 - Saturday Night Fever at the Roundhouse, Chalk Farm.
Claudia Winkleman arriving at the BAFTA Nominees Reception, the Natural History Museum, London on February 10, 2007.
Doug Peters/EMPICS Entertainment
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In a statement, Winkleman added: "I'm not often speechless but the chance to be with the wonderful Radio 2 listeners every Saturday has left me, quite frankly, gobsmacked.
"I hope my voice comes back in time for the first show as I can no longer simply rely on a fake tan and a fringe.
"There's nobody I'd rather be with at the weekend, it's a privilege and an honour."
Chat show host Norton, 57, sent his congratulations on Twitter.
He said: "Congratulations @ClaudiaWinkle You'll love it!! Welcome to @BBCRadio2 Saturday mornings!!"
Norton will present his final Saturday programme on Radio 2 on December 19, 10 years after his first Saturday morning show for the station.
Winkleman joined Radio 2 in spring 2008, hosting a comedy quiz series called Hot Gossip before moving to Friday nights to host the Claudia Winkleman Arts Show.
Helen Thomas, head of Radio 2, said: "As Claudia is one of the UK's best-loved entertainers and a firm favourite with our listeners, I'm over the moon that she'll be bringing her enormous warmth and wit to Saturday mornings on Radio 2."
The Radio 2 Saturday morning show airs from 10am to 1pm.