Dan MacMedan/WireImage.com

A first name is apparently the only attribute Angela Kinsey shares with her prudish Office character.

The sitcom star and her TV-writer hubby Warren Lieberstein (who obviously never euthanized her cat) welcomed daughter Isabel Ruby Lieberstein on Saturday afternoon, People reports. The little one weighed in at 6 pounds, 14 ounces.

"Mom and baby are doing great," rep Tess Finkle said. This is the couple's first child.

Proving that it's not always terrible to take your work home with you, Kinsey's longtime costar Jenna Fischer was among the friends and family members awaiting Isabel's arrival at the hospital.

"By the way, Jenna has the best reactions of anyone," Kinsey wrote in February on her MySpace blog, the medium she used to announce her pregnancy in November. "If you have big news to tell someone and want a great response...tell Jenna!"

When she revealed the good news, the 36-year-old actress also noted that her mother was already "quilting like a mad woman."

Dwight would be so pleased.