Can Ben Affleck and Jennifer Garner handle three girls?

Jan 19, 2012 at 2:46 p.m. ET

Jennifer Garner and Ben Affleck are expecting their third child to arrive soon -- but not as soon as you think!

Jennifer Garner, Seraphina

Jennifer Garner's baby bump may make you think she's due any day, but it turns out the 39-year-old isn't expecting her third child to arrive until spring!

Despite her long off due date Jennifer Garner joked she looks "17 and a half months pregnant."

Jennifer Garner stopped by The Tonight Show with Jay Leno Wednesday to talk about her pregnancy and family life with 6-year-old Violet, 3-year-old Seraphina and husband Ben Affleck.

"Our girls are working on names," Jennifer Garner shared. At first they were definitely Disney. It was like, Donald Duck, Minnie Mouse Affleck. And then they've moved on. Then it was Peter Pan, Captain Hook, Smee."

The Butter star continued, "They're coming up with lists, and coming in and saying, 'Let's have a baby-naming contest! Let's have a baby-naming poll!' They ask everyone, cause they just want to know. But we're not telling."

Best celebrity pregnancies announced in 2011 >>

On the subject of the baby's gender Jennifer Garner revealed that she and Ben Affleck know, but aren't sharing the news publicly. During their chat, Jay Leno inquired on if the actor had his hopes up for the baby to be a boy.

"I would have thought so," Jennifer Garner replied. "At first I think I really thought so. And then he kind of said, 'Well, we have girls. We know how to do girls. My girls love me. I'm the big guy in the house.' So, now I'm not sure."

Watch a clip of Jennifer Garner's appearance on The Tonight Show with Jay Leno here!

Do you think Jennifer Garner is expecting a boy or a girl?

Image via WENN