ARE Derek Jeter and Minka Kelly (above) ready to take the next step? "Derek and Minka are secretly engaged," an insider told Page Six. The Yankee captain and the actress are telling close pals to "save the date" for nuptials in the fall. "The wedding is being planned and will take place after baseball season is over," said our source. A rep for Kelly said, "There is no fall wedding planned to Derek Jeter." Remember -- Kelly also denied they were dating when we spotted her with Jeter at the Empire Hotel last year.