“A River Runs Through It” star Brad Pitt has committed in principle to TriStar Pictures’ $ 35 million production “Legends of the Fall,” a deal that hinges on whether David Geffen Co. and Warner Bros. agree to push back the start on “Interview With a Vampire” to as late as Oct. 1.

While WB officials declined comment, a studio insider confirmed that production of “Vampire,” to be directed by Neil Jordan, will not begin as planned in April and won’t roll until August or September.

By press time yesterday, TriStar was still awaiting official word from Geffen on the status of “Vampire.”

Geffen declined comment yesterday through his publicist.

TriStar submitted an offer for Pitt to star in “Legends” on Tuesday night, which the star’s Creative Artist Agency and Brillstein-Grey Entertainment management team informally accepted — contingent on the start date for “Vampire ,” studio sources confirmed.

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