Dax Shepard accidentally taught his daughter the 'F word'.

Dax Shepard and Kristen Bell

Dax Shepard and Kristen Bell

The 42-year-old actor has revealed three-year-old Lincoln - whom he has with his wife Kristen Bell - has picked up swear words from her father's vocabulary after he swore outside of her room once when he got the bridge of his nose stuck in her bookshelf.

Recalling the incident on 'The Ellen DeGeneres Show' on Tuesday (14.03.17), he said: "The worst part of the story is two days later Kristen's walking down the hallway. And Lincoln's in her room trying to get this sweatshirt off - she's like three - and her arms are all bound up in it and she's getting frustrated and she goes, 'Ow! F**k!'"

The 'CHiPs' star - who also has two-year-old daughter Delta with the 'Frozen' actress, whom he married in 2013 - also joked that the "worst" part of "owning" children is that they wake up really early.

He said: "The worst thing that can happen - if you have kids, you know this - the worse thing of owning them is they wake up so early.

"I don't know why what they think they're going to do, but uh..."

Asked what he meant by "owning them", he laughed: "Well, we own a couple of these kids. We got a 2013 model and a 2015 model, low miles if anyone's in the market! All highway. They're gorgeous."