'Grey's Anatomy' Star Camilla Luddington Reveals Sex of Her Baby With the Cutest Onesie

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Camilla Luddington wants to raise a strong woman.

The 33-year-old actress shared with her Instagram followers on Friday that she is expecting a girl by posting a photo of herself holding up a onesie that read: "Tomb Raider in training."

WATCH: Camilla Luddington Puts Her Baby Bump on Full Display in Sheer Black Dress at the People's Choice Awards

"I am so excited to announce today that I am having a girl!" the Grey's Anatomy star exclaimed. "I want her to grow up knowing how strong women are ...To be a little warrior who is not afraid to use her voice and stand up for what she believes is right."

Luddington added, "To navigate through life with courage and kindness, and to be one of the girls who says, 'You CAN sit with us.'"

WATCH: Ellen Pompeo Shares 'Boy Crazy' Video Dancing With Infant Son

ET caught up with Luddington
in January at Disney/ABC’s Television Critics Association all-star cocktail party, and she gushed over the parenting advice she'd received from her Grey's co-stars, Ellen Pompeo and Caterina Scorsone. "It's been great to be surrounded by so many moms," she shared. "In my head, I'm imagining huge play dates mid-O.R. scene!"

Luddington's baby bump was on full display at the People's Choice Awards later that month when she hit the red carpet in a body-hugging Heidi Merrick Obsidian dress. She joked with ET that she and her beau, Matt Alan, have been "rubbing it for good luck."