Former E.R. star Linda Cardellini has let it slip she's expecting a baby girl in the New Year (12).

The actress knows the sex of her first child but she's reluctant to let the world know.

She tells news show Access Hollywood, "We do know (but) do we tell? I don’t know. Sometimes I slip."

And then she stated, "We have five different names we’ll just pick out of a hat when we see her."

Linda Cardellini admits she can't wait to become a mum, and that she's enjoying pregnancy now her morning sickness nightmare is over: "Morning sickness was terrible the first four months. It was awful. I was kind of a monster.

"Now I feel great, and it’s amazing and I can feel kicking and it’s a totally unbelievable experience."