FIRST Lady Laura Bush will guest-host the third hour of “Today” next Tuesday.

One of the First Lady’s guests will be her daughter, Jenna Bush, with whom she’s co-authored a new children’s book, “Read All About It!” Mrs. Bush is scheduled to participate in several “Today” show segments and interviews and will also give Ann Curry a (pre-recorded) tour of the Bush ranch in Crawford, Texas.

There could also be a “surprise” guest or two dropping by during the hour, a show spokeswoman said yesterday.

Mrs. Bush will be co-hosting with Curry, Matt Lauer, Al Roker and Natalie Morales.