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Kathryn Hahnwasfeeling the mom guiltafter her sonLeonardapproached her one day asking why the tooth fairy hadn’t come to take his tooth yet.

During a Thursday appearance onGMA Day, theBad Momsstar, 45, was asked whether she had ever had a “bad mom moment in your own life.”

“He was like, ‘The tooth fairy still hasn’t come’ and I was like, ‘That’s weird. Really? Gosh, are you sure you put it under the pillow?’ ” she continued, explaining that, “Meanwhile, I’msweating profusely with guilt.”

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“The tooth fairy left him 20 bucks because she felt a little guilty, maybe,” the actress admitted, explaining that she also left him a note on behalf of the tooth fairy that read, ” ‘Happy last tooth. That was fun. Love, the tooth fairy.’ ”

“And I was bawling because I was like, ‘Thatwasfun. It was the last tooth and it’s over,’ ” she shared. “Ugh, I can’tstand how fast it goes.”

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Musing that $20 was a lot for a single tooth,GMA Dayco-hostSara Hainesremarked, “I only ever got a quarter from the tooth fairy, so clearly the New York tooth fairy is much more — “

“This was L.A. tooth fairy,” Hahn interjected, before adding, “Listen, I’m not proud, and that was the last tooth.”

“It’s last-tooth inflation,” co-hostMichael Strahanquipped.

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Hahn — who also shares daughterMae, 9, with husband Ethan Sandler — previously opened up to PEOPLE about twopieces of advice her own mothergave her that she values highly.

“One was, ‘The days are long and the years are short,’ which I remember,” she remarked in the November 2017 interview alongside her A Bad Moms ChristmascostarsMila KunisandKristen Bell.

Continued Hahn, “Another one was, ‘When you’re in doubt, don’t.’ Which is just good life advice, I think. If you’re waffling, there’s a reason.”

source: people.com