Sounds like Olivia Wilde's two kids have a bit of a sibling rivalry!

In a new interview, the 33-year-old actress candidly revealed her son Otis, 3, is like a "drill sergeant" to his younger sister, Daisy, 8 months.

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"I don't know who let him watch Full Metal Jacket, but he is so hard on her," Olivia joked during a Tuesday, June 13 sit-down on [The Late Show with Stephen Colbert](https://www.youtube.com/watch?timecontinue=507&v=tUcCNuin9tk)_.

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"He's really putting her through the works, it's boot camp. So she's going to come out of it really ripped and with a great attitude. But he screams!" she continued.

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"'You don't live here!' is what he screams at her," Olivia added. Too funny! The Tron: Legacy star and her fiancé, Jason Sudeikis, 41, welcomed Otis in April 2014 and Daisy in October 2016.

While speaking with Stephen Colbert, Olivia added that she doesn't understand why Otis is so tough on Daisy because she got along with her siblings just fine! "I have an older sister who was so nice to me, so I'm not familiar with this," she shared.

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"But I have a little brother and I was nice to him. So I don't know. I think he's aware that he's sharing me with her because I'm on Broadway and as everyone who's in a play will tell you, you miss a lot of bedtimes and it's tough," Olivia added.

Check out the gallery to see more celebrity babies born in 2016!