Hilaria Baldwin spoke about the incident on social media, telling her followers her son was "so proud of himself"

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Kids do the darndest things!

On Tuesday, Hilaria Baldwin revealed that her son Rafael Thomas peed in a sippy cup — and wasn’t ashamed in the least bit.

“Rafa just peed in this cup…. like no joke. I have 4 kids…. it’s hard to surprise me — and this left me speechless,” Baldwin, 35, wrote on Instagram alongside a photo of herself holding the cup.

“He was so proud of himself and comes up to me and says: ‘Mommy! I just peed in a cup!’ ”

“He led me over to this blue sippy cup and sure enough it was filled with warm pee,” Baldwin continued.

In addition to giving Baldwin a good laugh, Rafael, 3, also managed to make his mom proud.

“He didn’t spill ONE DROP on the floor. I was impressed. Then I was like: do I chastise him? How do you parent there?!?!?! So I told him thank you for telling me and that we need to pee in the toilet. Then he backtracked and tried to tell me he actually made me a cup of tea… I guess it was warm, so it was a good try,” Baldwin wrote. “Then he went back to the truth. Oh parenthood!!!!”

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Hilaria and Alec Baldwin with their children
| Credit: Hilaria Baldwin/Instagram

Baldwin married husband Alec Baldwin in 2012 and also shares daughter Carmen Gabriela, 5, and sons Leonardo Ángel Charles, 2, and Romeo Alejandro David, 8 months, with the Saturday Night Live star.

While the couple certainly has their hands full, Baldwin isn’t exactly closing the door on having more kids.

“I have a daughter and then I have three boys,” Baldwin said during an appearance on the Today Show in July. “And my daughter is very sure that she is going to have a sister.”

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Alec and Hilaria Baldwin with their children
| Credit: Hilaria Baldwin Instagram

“She does have a sister — she has Ireland, and Ireland is so wonderful and they have a great relationship,” she added of Alec’s 22-year-old model daughter from his previous relationship with Kim Basinger.

“But there’s something about a little sister that she really wants,” said Baldwin.

“I think it’s possible. Not [for sure],” Baldwin admitted, replying when Hoda Kotb asked whether her husband is on board. “Alec thinks it’s very possible. He comes from a big family.”