The US actress Hilary Duff (36), mother of three children, has announced a new addition to her family. “Surprise, surprise!” She wrote on Instagram about a family snapshot with her three children and husband Matthew Koma (36).

In the photo, Duff holds one hand on her rounded baby bump and looks mock-shocked into the camera. Musician Koma also posted the photo on Instagram with reference to the upcoming baby number 4.

Duff (“Cheaper by the Dozen”) and songwriter Koma have two daughters together, aged five and two. Duff also has an eleven-year-old son from her first marriage to the hockey professional Mike Comrie.

Duff was already in front of the camera as a child; she played her first leading role as a ten-year-old in the film “Casper Meets Wendy”. She became known with the Disney series “Lizzie McGuire” (2001-2004). She appeared in films such as “Cinderella Story” and “The Perfect Man”. She was most recently seen in How I Met Your Father, a spin-off of the cult sitcom How I Met Your Mother. She has also recorded several pop albums.