@dannymasterson / Instagram 1 / 8
@dannymasterson / Instagram 1 / 8

Surprise ... Danny Masterson is a dad! The That '70s Show alum secretly welcomed his first child, a baby girl, with wife Bijou Phillips on Feb. 14, and shared the exciting news on Instagram Wednesday, Feb. 19.

PHOTOS: Dads on duty

"Hello friends. Beyond thrilled to announce the birth of our daughter Fianna Francis Masterson!" Masterson, 37, captioned a photo of himself with his baby girl resting on his chest. "Mom and baby are doing amazing. You can all refer to me as dj dadpants from now on...Wifey @bijouphillips will post a pic on her insta too. Cheers!" In the adorable photo, the new dad and his daughter are both fast asleep. Little Fianna is swaddled in a white blanket and wearing a tiny hat.

PHOTOS: Celebrity pregnancy confessions

Phillips, 33, also shared a photo of herself smiling while Fianna sleeps on her chest. "Fianna Francis Masterson, 2/14/14 8LBS, 5OZ, 21in, she is a perfect valentine!!!" the proud new mom wrote.

PHOTOS: Celebrity babies of the year

A source tells Us Weekly that Phillips had been "super excited and nervous" to welcome her daughter.

After dating for eight years, Masterson and Phillips married in October 2011 at an Irish castle.


Stars who got pregnant in their 40s

Celebrity babies of 2013

Year in celebritots 2013