The couple announced their separation in a joint statement, saying they had "come to the end of our rainbow", reported Daily Mirror.
A statement posted on both their Twitter accounts read: "With great sadness we are announcing that we have separated. After many exciting adventures together over the last 18 years we have come to the end of our rainbow."
"We are still great friends and will continue to support each other and raise our beautiful children together, living next door but one."
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