'The Mentalist' Star Robin Tunney Gives Birth to a Baby Boy -- See the Adorable Pics!

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Robin Tunney gave birth to a baby boy!

The 44-year-old actress and her fiancé, interior designer Nicky Marmet, welcomed their first child together last month. On Wednesday, Tunney shared photos of her precious newborn on Instagram, alongside an apology for keeping her pregnancy under wraps.

WATCH: Why Tyra Banks Hid Her Baby News From Her Closest Friends 

"My greatest work, Oscar Holly Marmet," Tunney wrote next to a snap of the sleeping baby. "Sorry I didn’t talk about being pregnant. Wanted to keep it all for myself #momlife #bestbaby #solinlove."

The Mentalist star also shared a family photo with Marmet holding Oscar while she holds their dog, Rufus. "First photo of the whole family," she wrote. "Rufus would have preferred we'd gotten another dog."

Tunney is among a growing list of celebs to stay mum on pregnancy news. Watch Laura Linney explain why she didn’t announce her 2014 pregnancy in the video below.

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