Sarah Clarke was pregnant during filming and only her on-screen daughter knew.

Babies are fun… but secret babies are even better. Kristen Stewart was the only person on the set of Eclipse who knew that her on-screen mom Sarah Clarke was getting ready to have a baby of her own! “I just looked over at her and said, ‘I’m so nauseous… because I’m pregnant,’” Sarah told HollywoodLife.com exclusively June 24 during the Eclipse premiere at LA’s Staples Center. “So then it was like our little secret. It was great! She brought me food.”

Aw! It sounds like K-Stew really stepped it up.

“I couldn’t tell anybody because it was still early, but I told her, ‘If I’m so lethargic, just understand,’” Sarah told us. “[Kristen] was so great. She was like, ‘Oh my God, just go be a mom.’”

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