Jennifer Garner has revealed she knows the sex of her third baby with Ben Affleck, but she's sworn to secrecy until she gives birth next month.

Garner already has two daughters, Violet, 6 and Seraphina, 3, and previously revealed that she doesn't have a preference about the sex of her third child. It seems Affleck, however, doesn't feel the same way. On Wednesday Garner told Jay Leno that she always thought Affleck wanted a boy, but now she isn't so sure.

I would have thought [he wanted a boy]. At first I really thought so, Garner said on The Tonight Show And then he kind of said, well we have girls we know how to do girls, my girls love me. I'm a big guy in the house.

Garner's child is due in February, but she still hasn't decided on a name.

Our girls are working on names, she told Leno. At first they were definitely Disney. It was like, Donald Duck, Minnie Mouse Affleck, and then they moved onto Peter Pan, Captain Hook, and Smee.

The short-list of Disney names Garner gave were dominated by male names, which has lead Garner, Affleck fans to speculate that the couple will have a boy.

The actress also joked about calling her baby Jackman. Talking to Leno about a sex scene with her Butter co-star, Hugh Jackman, she said, after some heavy breathing and making simulated sex noises for the film's soundtrack, I could have said to Hugh: Let's name this baby Jackman. This is Jack man Louise, honey.

Meanwhile, Garner and Affleck were spotted with their two daughters at the Bel-Air Hotel last weekend. The couple picked their children up from ballet and karate class and indulged in a hearty breakfast at the hotel, according to Pop Sugar.

Affleck is still sporting a full grown out beard style, with long hair. Garner looked healthy and happy as she nears the 9-month mark of her pregnancy.