The couple, who have have a daughter called Polly together, tied the knot in September last year but are now 'living apart", according to reports.
A friend told The Mirror: "They are spending time apart at the moment. This could be the beginning of the end."
Kym currently lives in Manchester, which is close to the Coronation Street set. Jamie, meanwhile, is reportedly spending five nights a week in London after landing a part in EastEnders.
Reveal contacted Kym's agent but was told the actress had no comment to make. Jamie's rep has not yet responded.
Kym, 37, and former Hollyoaks star Jamie, 33, first started dating in July 2008. A year later, the couple sadly suffered the loss of their son Archie after he was born 18 weeks prematurely.
In March 2011, Kym and Jamie welcomed their daughter Poppy into the world and, in September last year, they married in a lavish ceremony held in Cheshire.
Kym has two children from a previous relationship, Emily and David, and got divorced from her first husband - EastEnders star Jack Ryder - in March 2008, following seven and a half years of marriage.
She rose to fame in 2001 after landing a part in Popstars band Hear'Say.
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