Alec Baldwin -- Ben Franklin Movie Plans Revealed in Soap Star's Divorce

Alec Baldwin wanted to play Benjamin Franklin in a new movie ... and we didn't find out from an agent, a publicist or a movie studio ... we found out from the divorce docs of a TV soap star.

"The Bold and the Beautiful" star Katherine Kelly Lang finalized her divorce this week from hubby Alex D'Andrea ... and in the docs, she gives up any claim to movie projects D'Andrea was involved with ... including the Franklin flick.

In the section marked Community Property Awarded Transferred to Respondent (Lang's ex), it mentions Walter Isaacson's book about Ben ... which had been optioned by D'Andrea, Alec and William Baldwin for a TV mini-series.

According to the docs, the three pitched the idea as a co-production with Sony, but it never found a home. Their option ran out and the rights reverted back to Isaacson because "Sony could not find a network to co-finance and/or broadcast the project."