Liz Lemon's got a not-so-little bump in a little black dress!

A beaming Tina Fey debuted her pregnancy curves while exiting the NYC studios of The Late Show with David Letterman on Monday night. See more photos of Tina's bump.

During a taping of The Oprah Winfrey Show last Wednesday, the 30 Rock star, 40, announced that she's expecting her second child with composer hubby Jeff Richmond.

The baby-to-be (due in late summer) will join big sister Alice, 5.

"I thought that raising an only child would be the norm in Manhattan, but my daughter is the only child in her class without a sibling," Fey wrote about having another little one in her memoir Bossypants. "Most kids have at least two."

"Who will be my daughter's family when my husband and I are dead from stress-induced cankers?" she said. "She must have a sibling."