Scrubs star Sarah Chalke and her fiancé, Jamie Afifi, are expecting their first child, her rep confirms to PEOPLE.

The couple, who got engaged in December 2006, will welcome the baby this winter.

Afifi, an entertainment lawyer, proposed to Chalke during a Hawaiian vacation.

"The best is just knowing that 100 percent somebody always has your back and you always have theirs," Chalke told PEOPLE earlier this year about being engaged. "You have a partner, you have a buddy."

Chalke, 32, recently starred in Lifetime's Maneater. Her Scrubs costar Judy Reyes is also pregnant and due with a girl this November.