Rachel, who stars on Countdown, is said to have grown apart from Jamie Gilbert, who she tied the knot with in August 2012 following an on/off courtship spanning seven years.
The maths genius is said to have stunned millionaire Jamie, family and friends with the news but insisted that no-one else is involved in the separation.
A source told The Sun: "Rachel just told him they had grown apart." Rachel's spokesman has declined to comment on the reports.
Rachel was partnered with professional dancer Pasha Kovalev in the current series of Strictly Come Dancing, however they were voted off earlier this month.
The star rose to fame in 2009 after landing a job as Carol Voderman's replacement on C4 show Countdown.
Despite not having any television experience, Rachel impressed bosses and now graces our screens every weekday afternoon.
Her job means she has to work away from home for six days each week.
Rachel got straight As at school but had no dancing experience when she signed up to this year's Strictly.
She did, however, learn a choreographed routine for her wedding day in 2012.
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