Jenna Bush Hager "never wears underwear".
The 40-year-old star seemed embarrassed when her 'Today with Hoda and Jenna' co-host , Hoda Kotb, told the studio audience that she had just learned her friend always goes commando.
Hoda revealed: "I was a little surprised because Jenna and I know a lot about each other."
Explaining she had "noticed" right before the show when the pair went to get changed for the programme, she added: "I just had a little shock with it."
Jenna - who is the daughter of former US president George W. Bush and his wife Laura - exclaimed: "You promised me you wouldn't do this! There's a lot of people here!"
She then jokingly added: "I'm sure my mom has never been more proud."
And the mother-of-three insisted there were "a lot of pros" to not wearing underwear.
She said: "I think it makes a more pretty silhouette! I also think you don't have to pack as much. There's a lot of pros to it!"
However, Hoda insisted there were downsides too, though she could see the benefits.
She said:"It actually does make life a lot easier.
"[But] it's a lot of washing of clothes, over and over."
But that didn't seem to bother Jenna too much: "[Hoda] said, 'Do you wash your clothes' and I said 'Yes, I do.'
"But it's also not like I'm sharing your jeans with you. Though I do steal Savannah [Guthrie]'s pants on occasion."
She then asked Hoda: "And I do want to borrow that red suit of yours. Can I?"
Her pal replied: "Yes, you can, anytime."
Jenna joked: "I'll wear underwear."