Constance Briscoe, 56, a lawyer and part-time judge, was convicted of perverting the course of justice in connection with the downfall of her neighbour Huhne, who resigned as Britain's energy secretary in 2012.
Liberal Democrat Huhne was jailed last year after he admitted perverting justice by passing speeding points to his then-wife Vicky Pryce in 2003 so that he would avoid a driving ban.
Pryce, a high-flying Greek-born economist, denied the charge but was found guilty by a jury and was also sent to prison.
At the Old Bailey court in London, the jury heard that Briscoe helped Pryce, her friend and neighbour, to leak information about Huhne's points-swapping to newspapers.
Huhne and Pryce both served a quarter of their eight- month prison sentences, and Briscoe was told she too could expect to go to jail.
"It's almost inevitable there will be a custodial sentence," said judge Jeremy Baker.
Briscoe had initially presented herself to police as an objective witness in the case, but it later emerged that she had spoken frequently with Pryce and had contacted the newspapers.
Emails handed over by newspapers later proved she had been in touch with reporters.
She then deliberately gave a different copy of the altered statement to an expert so he would find it was due to a printer malfunction, the prosecution said.
The political career of Huhne, who once stood against Deputy Prime Minister Nick Clegg for the leadership of the Liberal Democrat party, was destroyed by the case.
"Constance Briscoe has been revealed as a compulsive and self-publicising fantasist," he said in a statement.
"British justice is likely to be a lot fairer with Briscoe behind bars.
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