Desperately hoping to rid himself of an unwanted baby, Robert Blake (search) once enlisted screen legend Marlon Brando (search) to help persuade his soon-to-be slain wife to have an abortion, according to court records reviewed Thursday by The Post.

The oddball, only-in-Hollywood revelation came during depositions in Blake's upcoming civil trial, in which the estate of his late wife, Bonny Lee Bakley (search), is suing the former "Baretta" star for wrongful death.

Bakley, 44, was gunned down in 2001 inside Blake's car after they dined at a Studio City restaurant. Blake beat a murder rap in criminal court earlier this year, but will have to defend himself — and testify — during a civil trial that's set to begin later this month.

Blake, 71, said he hoped Brando could influence the celebrity-obsessed Bakley, who once fooled around with The Godfather's son Christian Brando.

"That conversation was about Bonny being pregnant, and I was kind of beating around the bush to see if he could help me ... have Christian convince her to have an abortion," Blake said of his phone chat with Marlon Brando.

"And he said, 'Well, we know all about her, and she's been around for quite a while, in and out of Christian's life,' and one thing or another, and the conversation just kind of hung out there, and that was it."

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