The pop star and former Liverpool footballer were granted a divorce decree at the Central Family Court in London by judge Ian Mulkis on Friday.
The judge granted a decree nisi, and either the husband or wife will be able to apply for a decree absolute, finally formalising the divorce, six weeks after it is granted.
Louise, now 43, was a finalist in the 2016 edition of Strictly Come Dancing while Jamie is a football pundit.
They married in 1998 aboard a luxury yacht in Bermuda, and went on to have two sons who are now nine and 13.
Ms Redknapp, who went by the name Louise for much of her pop career, was a member of R&B girl group Eternal and achieved solo success with tracks including Naked.
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She told the Daily Telegraph that participating in Strictly has given her a new lease of life after what she said was an experience of “a sort of Stepford Wife”.
“It was only when I agreed to do Strictly Come Dancing that I realised I couldn’t just go back to that,” she said.