Something's in the water on the 30 Rock set!

Tina Fey announced during a taping of The Oprah Winfrey Show on Wednesday that she's expecting her second child, according to People magazine. The funnywoman joins in the baby joy with co-star and first-time mommy-to-be Jane Krakowski, who already been showing off her growing baby bump.

Fey, 42, will appear alongside Oprah on April 12 to promote her new book, Bossypants, and the upcoming Saturday Night Live reunion.