"He knew he had to show his butt cheeks and he was trying to pump them up and get them in good shape, and he just was a little bit nervous and wanted me to tend to what's down there," said Kristen. "I said, 'Well, happily I'll do it.'"
While Dax called it a "terrible experience" during an appearance on Conan, Kristen apparently maintained a chipper demeanor through the process, singing "Funkytown" by Lipps Inc.
"It's the only way I could get through it," said Kristen.
As for becoming a parent, she says, "It's way more fun than you anticipate. Everyone with horror stories talks the loudest but what they don't say is, 'Oh yeah, and then you get this little thing that is your permanent best friend.'"
Now, Kristen is trying to get the world through its current hunger crisis.
The House of Lies star has teamed up with former Veronica Mars co-star Ryan Devlin for a new charity called This Bar Saves Lives.