The pair have been together since 1999, got engaged in 2009 and married a year later.
Kirsty and the former England rugby player have two sons together, seven-year-old, Oscar and four-year-old, Jude.
A spokesperson for the couple confirmed the news today but insisted that no one else was involved.
The couple had reportedly been unhappy for some time. It is believed Paul’s early retirement in 2011 due to injury put a lot of strain on the relationship.