The pair are thought to have met on the set of Celebrity Who Wants To Be A Millionaire? seven years ago.
They reportedly bonded over their shared interests, with Louise also working in TV and being passionate about cars.
James reportedly split from James Bond boss Barbara, 59, in 2005, after four years together.
Read the full interview in Prima’s May issue, on sale now.
James Martin’s Islands to Highlands airs weekdays at 2pm on ITV, while Saturday Morning continues this weekend at 9.25am on the same channel.