Getting back to work since giving birth to Sadie Grace in January has "been so rough," Applegate tells PEOPLE. "It's a really hard thing to do because you miss them. But I'm doing well.

By peoplestaff225
Updated August 03, 2011 04:00 PM
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Christina Applegate‘s latest sitcom hits close to home.

The new mom, 39, stars opposite Will Arnett in NBC’s Up All Night, a show about a couple who struggles to balance their home and work lives while raising their baby.

Getting back to work since giving birth to Sadie Grace in January has “been so rough,” Applegate tells PEOPLE. “It’s a really hard thing to do because you miss them. But I’m doing well.”

Even though the actress seems excited about her latest endeavor, her 6-month-old daughter with fiancé Martyn LeNoble remains her number one priority.

“Parenthood just changed me in the sense that nothing really matters but [Sadie],” Applegate explains.

“None of it really matters. The importance I placed on things prior to this moment, they don’t matter anymore. All that matters is I get to go in there in the morning and see her face. She smiles at me and my life is better.”

— Dahvi Shira