"He’s great, he’s just… I’ve scored big time", Charlize said when Ellen asked how he was.
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Charlize Theron and Seth MacFarlane
The Oscar-winning actress then went on to admit that Seth has nicknamed her son the "little Republican".
"He's just always saying no…'No, no, no, no, no, no...' Everything's no. No, no, no, no, no, no…No, Seth, no. Mama, no. No.' It's a lot of that", laughed Charlize whilst Seth laughed alongside her.
When Ellen asked about the word why which is often popular with children, Charlize said: "No, he’s not there yet. He’s a little slow on the speech, but he’s hitting the no really well."
The cast of A Million Ways To Die In The West
The pair were on the show to promote their new film A Million Ways To Die In The West, and Charlize revealed to the audience how Jackson believed her co-star Amanda Seyfried was a princess."I was driving him to kindergarten two days ago and we were stopping, you know, and he said 'Mama, mama, mama' pointing at the posters. There's the one of all four of us, and we were at a light and he said 'Mama wears cowboy hat' and I was like 'Wow, that's great!', and as I look back there's a big grin on his face and he just goes 'other lady princess'.
"And he thought Amanda was a princess and Mom just wore a cowboy hat."
Charlize Theron and her son Jackson
Charlize also revealed that her mother found a letter Charlize had written to her as a little girl.