The 32-year-old model-TV presenter has stepped away from co-hosting the show after two years and will be replaced by 'Big Brother' presenter Emma Willis, reported BBC online.
"After much consideration, I will not be returning for series three of The Voice UK. I've had two wonderful years on the show, and I feel very privileged to have been a part of it," Willoughby said in a statement.
Willoughby says she wants to find the correct balance between professional and family life so she can spend more time with her children.
"I couldn't be more excited to be a part of it and I cannot wait to get started," she said.
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Reggie Yates, who was the other co-host of 'The Voice UK', revealed on Twitter that he has also stepped away from the show, but no replacement has been announced yet.
Australian pop icon Kylie Minogue is also taking pop star Jessie J's seat as one of the judges in the series.
'The Voice UK' will air in January 2014.