Christina Applegate doesn't just play a mom on TV -- and yesterday, her real life child was spotted on her TV life set.
The 39-year-old actress brought adorable 10-month-old daughter Sadie to the set of "Up All Night," where they hung out together between takes.
How cute is she?!
Sadie is Applegate's first child with fiance Martyn LeNoble, who popped the question on Valentine's Day 2010.