In her new memoir, The Princess Diarist, Fisher writes that she began an "intense" affair with Ford in 1976, when he was 33 and she was 19, that went on for several months while they were filming the beloved sci-fi movie.
On Monday's Today show, Fisher told co-anchor Savannah Guthrie that she gave Ford a heads up that she would be sharing details of their alleged romance in her book. "He's incredibly private," she said. "I feel really bad doing that to him."
American actors Mark Hamill, Carrie Fisher and Harrison Ford on the set of Star Wars: Episode IV - A New Hope written, directed and produced by Georges Lucas. (Photo by Sunset Boulevard/Corbis via Getty Images)
American actors Carrie Fisher and Harrison Ford on the set of Star Wars: Episode V - The Empire Strikes Back directed by Irvin Kershner. (Photo by Lucasfilm/Sunset Boulevard/Corbis via Getty Images)
American actors Carrie Fisher, Harrison Ford and British Anthony Daniels on the set of Star Wars: Episode V - The Empire Strikes Back directed by Irvin Kershner. (Photo by Lucasfilm/Sunset Boulevard/Corbis via Getty Images)
American actors Carrie Fisher and Harrison Ford at a press conference for one of the 'Star Wars' films, circa 1980. (Photo by Maureen Donaldson/Getty Images)
JUN 15 1977, MAY 30 1978, JUN 4 1978; 'Star Wars' has Given three Performers that 'All-Important Break'; Featured in the popular science fantasy movie are, from left, Mark Hamill, Carrie Fisher and Harrison Ford.; (Photo By Steve Larson/The Denver Post via Getty Images)
UNITED STATES - CIRCA 2002: Harrison Ford and Carrie Fisher on Fifth Ave outside The Plaza hotel. They were in town for the movie 'Star Wars.' (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
American actors Billy Dee Williams, Harrison Ford, Carrie Fisher and Mark Hamill on the set of Star Wars: Episode V - The Empire Strikes Back directed by Irvin Kershner. (Photo by Lucasfilm/Sunset Boulevard/Corbis via Getty Images)
Carrie Fisher, George Lucas, Harrison Ford & Geri Halliwell (Photo by Jean-Paul Aussenard/WireImage)
HOLLYWOOD - JUNE 09: (L-R) Actors Mark Hamill, Carrie Fisher and Harrison Ford speak onstage during the 33rd AFI Life Achievement Award tribute to George Lucas at the Kodak Theatre on June 9, 2005 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
SAN DIEGO, CA - JULY 10: (L-R) Actors Carrie Fisher, Mark Hamill and Harrison Ford pose onstage at the Lucasfilm panel during Comic-Con International 2015 at the San Diego Convention Center on July 10, 2015 in San Diego, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD - JUNE 09: (L to R) Jett Lucas, his father director George Lucas, actors Carrie Fisher, Harrison Ford and director Steven Spielberg pose at the 33rd AFI Life Achievement Award after party at the Highlands on June 9, 2005 in Hollywood, California. (Photo by Vince Bucci/Getty Images)
BERLIN, GERMANY - MAY 08: Journalists take pictures of wax figures of the actors (L-R) Mark Hamill as the Star Wars character Luke Skywalker, Harrison Ford as the Star Wars character Han Solo, Carrie Fisher as the Star Wars character Leia Organa, a Stormtrooper, the Star Wars charakter Darth Vader and another Stormtrooper displayed on the occasion of Madame Tussauds Berlin Presents New Star Wars Wax Figures at Madame Tussauds on May 8, 2015 in Berlin, Germany. (Photo by Clemens Bilan/Getty Images)
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When asked if she was in love with Ford at the time of their romance, Fisher responded, "Well, I was 19. So, yeah. I was not sort of a cavalier-type person."
She also writes about being relieved when the alleged affair ended with Ford, as he was married Mary Marquardt with two children at the time. "I wasn't raised that way," Fisher told Guthrie. "But when you're on location, this is something I discovered, everything is permitted. I didn't know that. I haven't been on location since."
Fisher's book is made up of "forgotten" journal entries she made during her time portraying Princess Leia. The actress admitted that it was "sad" to go back and read her diary because she was "so insecure" back then.
"It's very raw," she explained. "Obviously I didn't expect anyone, including myself, to read it."