Actress Robin Tunney is a first-time mom

Actress Robin Tunney has given birth to her first child.

The Mentalist star and her fiance Nicky Marmet welcomed a son recently, and she surprised her Instagram followers on Tuesday (05Jul16) by posting the first photo of the little one - without ever having announced her pregnancy.

"My greatest work, Oscar Holly Marmet," she wrote. "Sorry I didn't talk about being pregnant. Wanted to keep it all for myself. #momlife #bestbaby #soinlove."

Robin and interior designer Nicky got engaged on Christmas Day, 2012, while on vacation in Rio de Janeiro, Brazil.

She was previously married to producer/director Bob Gosse from 1997 to 2002.