California-born Gwen kept a low profile throughout her pregnancy.
While reports emerged that she was several months pregnant at the end of August, Gwen didn't confirm the exciting news until late October.
Expectant stylist Rachel Zoe put an end to speculation by posting a picture of herself and Gwen showing off their baby bumps at the Beverly Hills' Wallis Annenberg Center for the Performing Arts Inaugural Gala.
Three months later Gwen revealed that she was expecting another boy.
"Was ready to hand over the crown," she tweeted. "But I guess I am still queen of the house. #itsaboy #surroundedbyboys."