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January Jones may be many months preg, but she's also gearing up to start shooting Mad Men season five, so keeping ultra fit is key for this mommy-to-be.

We caught up with the X-Men: First Class star as she left her weekly yoga class, looking ultra-fit and pregnant, in the Los Feliz area of LA.

Jones has kept the identity of her baby's father a secret since her pregnancy was announced this spring, but will that all change once the baby is born? We can't wait to find out!

Check out our exclusive video of Jones heading to yoga, below, and find out who slammed the star's acting in X-Men, after the jump ...