Sarah Chalke

It's a boy for Scrubs star Sarah Chalke and fiancé Jamie Afifi, People reports.

See photos from Scrubs

Chalke, 33, gave birth to son Charlie Rhodes Afifi on Christmas Eve. This is the first child for the couple, who have been engaged since December of 2006.

Chalke most recently returned to Scrubs as a guest star when the show returned in October. Her pregnancy was written into the show for her character, Elliot.