Jenna Bush Hager makes jaw-dropping reveal about grandma Barbara Bush on 'Today'

Jenna Bush Hager feels "terrible" about a big reveal she made about her grandmother, Barbara Bush, on Monday's episode of the "Today" show.

While filling in for Hoda Kotb, Hager was chatting with Kathie Lee Gifford over white wine about the pros and cons of wearing shoes inside when she unexpectedly shared the previously-unknown detail about the former first lady.

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"Listen, do you want to know the truth?" Hager asked Gifford mid-conversation. "My grandma's missing a toe on each foot."

Cue a stunned Gifford, who took more than a few seconds to get a response out. "Barbara?" she asked.

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BEVERLY HILLS, CA - JANUARY 08: 74th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: TV personality Jenna Bush Hager arrives to the 74th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 8, 2017. (Photo by Kevork Djansezian/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 17: Jenna Bush Hager and Brandon Jones attend Edible Schoolyard NYC Annual Harvest Dinner with Chef Massimo Bottura, Hosted by Lela Rose at Private Residence on November 17, 2016 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - OCTOBER 31: Jenna Bush Hager dressed as her grandmother Barbara Bush during NBC's 'Today' Halloween at Rockefeller Plaza on October 31, 2016 in New York City. (Photo by Roy Rochlin/FilmMagic)
NEW YORK, NY - MAY 20: NBC TV Personality Jenna Bush Hager attends the Puff Daddy and The Family Performance On NBC's 'Today'at Rockefeller Plaza on May 20, 2016 in New York City. (Photo by Mark Sagliocco/Getty Images)
THE VIEW - Margaret Cho and Jenna Bush are the guests today on 'THE VIEW,' 5/19/16 (11:00 a.m. - 12:00 noon, ET) airing on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) JENNA BUSH
NEW YORK, NY - SEPTEMBER 8: Jenna Bush Hager attends the women's semifinals during day 11 of the 2016 US Open at USTA Billie Jean King National Tennis Center on September 8, 2016 in the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
NEW YORK, NY - MAY 11: Co-authors Laura Bush (L) and Jenna Bush-Hager attend 92Y Talks: Laura Bush & Jenna Bush-Hager on May 11, 2016 in New York, New York. (Photo by Andrew Toth/FilmMagic)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0468 -- Pictured: (l-r) Jenna Bush Hager and Former First Lady Laura Bush on May 10, 2016 -- (Photo by: Andrew Lipovsky/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MAY 11: (L-R) Hoda Kotb, Laura Bush and Jenna Bush-Hager attend the 92Y Talks: Laura Bush & Jenna Bush-Hager on May 11, 2016 in New York, New York. (Photo by Andrew Toth/FilmMagic)
NEW YORK, NY - MAY 05: Editorial Director PEOPLE and EW, Jess Cagle and Jenna Bush Hager speak at the Time Inc. NEWFRONT at Gotham Hall on May 5, 2016 in New York City. (Photo by Jamie McCarthy/Getty Images for Time Inc.)
TODAY -- Pictured: (l-r) Jenna Bush, Natalie Morales, Al Roker, and Forest Whitaker appear on the 'Today' show on Wednesday, February 10, 2016 -- (Photo by: Heidi Gutman/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Wrangler -- Pictured: (l-r) Hoda Kotb, Wrangler, Jenna Bush Hager -- (Photo by: Heidi Gutman/NBC/NBC NewsWire via Getty Images)
KENNETT, MISSOURI - FEBRUARY 02: Jenna Bush Hager, a correspondent for The TODAY Show, joins Sheryl Crow, AdoptAClassroom.org and Farmers Insurance to surprise the teachers at Kennett High School with a $21,600 donation for classroom supplies at Kennett High School with an AdoptAClassroom.org Grant during a Pep Rally on February 2, 2016 in Kennett, Missouri (Photo by Jason Davis/Getty Images for Farmers Insurance)
NEW YORK, NY - DECEMBER 11: (L-R) Al Roker, Jenna Bush, Brittany Schreiber and Hoda Kotb attend the Billboard Women in Music Luncheon on December 11, 2015 in New York City. (Photo by Brian Ach/Getty Images for Billboard)
NEW YORK, NY - DECEMBER 11: Journalist Jenna Welch Bush Hager attends Billboard's 10th Annual Women In Music at Cipriani 42nd Street on December 11, 2015 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
NEW YORK, NY - SEPTEMBER 14: Jenna Bush Hager attends Lela Rose Spring 2016 during New York Fashion Week: The Shows at The Gallery, Skylight at Clarkson Sq on September 14, 2015 in New York City. (Photo by Cindy Ord/Getty Images for NYFW: The Shows)
NEW YORK, NY - SEPTEMBER 13: Teacher Jenna Bush Hager (L) and Barbara Pierce Bush attend Prabal Gurung Spring 2016 during New York Fashion Week: The Shows at The Arc, Skylight at Moynihan Station on September 13, 2015 in New York City. (Photo by Astrid Stawiarz/Getty Images for NYFW: The Shows)
NEW YORK, NY - SEPTEMBER 11: Jenna Bush Hager attends day twelve of the 2015 US Open at USTA Billie Jean King National Tennis Center on September 11, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
GREENWICH, CT - JUNE 05: Jenna Bush Hager listens at Greenwich Film Festival 2015 - All Things Must Pass Opening Night Premiere at Bow Tie Cinemas on June 5, 2015 in Greenwich, Connecticut. (Photo by Andrew H. Walker/Getty Images for Greenwich Film Festival 2015)
GREENWICH, CT - JUNE 05: (L-R) Director Colin Hanks, GIFF Founder Wendy Stapleton Reyes, Television Personality Jenna Bush Hager attend the Greenwich International Film Festival Opening Night Screening of 'All Things Must Pass' at the Bow Tie Cinema on June 5, 2015 in Greenwich, Connecticut. (Photo by Mark Sagliocco/WireImage)
GREENWICH, CT - JUNE 05: Author Jenna Bush Hager attends Greenwich Film Festival 2015 - All Things Must Pass Opening Night Premiere at Bow Tie Cinemas on June 5, 2015 in Greenwich, Connecticut. (Photo by Andrew H. Walker/Getty Images for Greenwich Film Festival 2015)
TODAY -- Pictured: (l-r) Tamron Hall, Al Roker and Jenna Bush Hager appear on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
NEW YORK, NY - MARCH 22: Jenna Bush Hager and Laura Bush are seen in Tribeca on March 22, 2015 in New York City. (Photo by Alo Ceballos/GC Images)
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"Has she ever divulged that?" she followed up.

"Not that I know of!" Hager said, starting to perhaps regret her reveal. "She has darling feet, and they look cute! [...] I think it's the second [toe]. Ganny, I'm sorry! I shouldn't have said it, but it happened with age [...] they say if you don't sleep much, your toes go away!"

For her part, Gifford could not have been more taken aback by the news and, for the most part, she could only manage to get out a smile.

"I feel terrible now," Hager finished. "Should I be embarrassed?"

Watch the full clip above.

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