Natascha McElhone: Californication
Karen's sexually depraved, on-again BF Hank gets a vasectomy during the season the actress herself became pregnant, so her character's bump was hidden beneath beachy blouses and artist smocks.
Molly Ringwald: The Secret Life of the American Teenager
It was a veritable baby boom when the actress playing the 15-year-old new mother's mom became pregnant herself. Unafraid of controversial storylines, the SLAT writers decided that first-time grandma Anne Juergens should give her grandson a new baby...wait, let's think about this for a second...um, uncle?
Jennifer Garner, Alias
The news of an impending baby Affleck didn't stop CIA operative Sydney Bristow from saving the world in various guises. Ouch for Garner's ex and costar Michael Vartan, though—no wonder Vaughn played dead for most of that final season.
Salli Richardson-Whitfield: Eureka
Instead of using sci-fi wizardry to hide the actress's pregnancy during filming on Syfy's hit show, producers added even more depth to her character's story arc: Allison Blake, mourning the death of her fiancé on their wedding day, was now carrying his child.
Gina Bellman: Leverage
Her overalls, coats and tables were conning no one, so producers sent Sophie abroad and limited her show involvement to above-the-neck telephone consultations with her team.

