04/07/2011 at 11:30 AM EDT
has some big news to talk about!
During a taping of The Oprah Winfrey Show
Wednesday, Fey revealed that she's expecting her second child.
The 30 Rock
star is five months along, her rep confirms to PEOPLE. Fey and her husband, composer Jeff Richmond, also have a 5½-year-old daughter
Fey, 40, shared the news during an appearance to promote her new book, Bossypants
, and an upcoming Saturday Night Live
reunion. Oprah's chat with Fey is scheduled to air April 12.
– Julie Jordan