"After six incredible years on the Radio 2 Breakfast Show, it's time for me to step away from the very early mornings and focus on family," she told listeners yesterday.
Ball later revealed that Mills, who hosts the mid-afternoon slot, would be her successor, with Friday 20 December earmarked as her last day on the show.
The move is part of a wider shuffle on Radio 2 - the BBC's most popular station, reaching about 13.3 million people a week - with Trevor Nelson taking up Mills's former slot, making him the first black presenter in Radio 2's daytime schedule.
Ball, 53, took over the Radio 2 morning programme in 2019 from Chris Evans. She was absent from the airwaves for nearly two months over the summer when Mills stepped in, returning in September amid speculation about her future with the station.
Announcing her departure on air, Ball said: "I've decided it's time to step away from the early alarm call and start a new chapter. You know I think the world of you all, listeners, and it truly has been such a privilege to share the mornings with you."
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
Beaumont may step in at RFU if Ilube quits over pay fiasco
Sir Bill Beaumont could be parachuted into the Rugby Football Union as interim chair in the event Tom Ilube falls on his sword amid the botched handling of the executive pay scandal engulfing the game.
'An exciting new era' Everton owners promise return to glory days after £500m deal
The Friedkin Group vowed to restore Everton to their \"rightful place in the Premier League table\" after completing a takeover that brought the turbulent era of Farhad Moshiri to an end.
Friedkin Group brings hope of much-needed stability and ambition
The Friedkin Group's takeover of Everton represents a momentous day for those exhausted and resigned to calamity by the tenure of Farhad Moshiri.
A humble Hamilton hero who was born to score
Ex-coaches in New Zealand on Chris Wood's rise from selfless schoolboy to poster boy at Nottingham Forest
Solanke puts Spurs through despite Forster's blunders
Like a song that changes time signature for the hell of it, like a friend that inexplicably blanks you, like a match report that noodles away for ages instead of just telling you what happened, Tottenham Hotspur remain medically incapable of doing things the simple way.
“The World Cup loss fuelled a fire in me to become the best’
Ellie Kildunne's infectious enthusiasm for the women's game has her dreaming of a Twickenham final in 2025
'Usyk is fighting for his country': Dubois tips Fury to lose rematch
Daniel Dubois, the IBF world heavyweight champion, believes that Oleksandr Usyk will again defeat Tyson Fury in Riyadh tomorrow night.
Coe pledges radical reform in bid for IOC presidency
Sebastian Coe has promised to radically transform the International Olympic Committee if he is elected its next president in March - and says his track record of delivering at the London 2012 Games and at World Athletics shows he is the right choice for the leading job in sport.
Football's new fetish Forget Nicolas Jover and stylish set-piece coaches, bring on the directors of vibes
It's 25 October 2012. Those of you who follow the Austrian regional leagues won't need reminding.
Rush to start work caused enormous cost overruns, says new boss of HS2
Enormous budget overruns on the HS2 high-speed railway have been blamed by its new chief executive on a \"rush to start\", as the Department for Transport admitted it did not know what the line would cost.
