Nicole Richie has taken to her official blog to post some adorable family portraits.

The 28-year-old and boyfriend Joel Madden, 30, became parents for the second time when Nicole have birth to baby son Sparrow in September.

The couple are already parents to 23-month-old daughter Harlow, who appears to be have a blast in the cute snaps.

She posted photos of the foursome in bed on her blog with the message: "Happy Wednesday!"

Introducing...