Not only did Gwen Stefani join Instagram on Friday, she also announced the gender of her baby - a boy.

The No Doubt lead singer and her husband Gavin Rossdale already have two boys - Kingston, 7, and Zuma, 5.

"I was ready to hand over the crown. but I guess I am still queen of the house. #itsaboy #surroundedbyboys," she wrote under a photo of herself wearing a crown.

Rossdale, 48, and Stefani, 44, tied the knot in 2002 after they met in the spring of 1996 and her lasting marriage is something she's very proud of.

"A miracle ... my biggest accomplishment is my marriage so far," Stefani said in the October 2013 issue of Marie Claire. "Because it's hard, everyone knows it's hard. (Marriage) is something that I always wanted to do successfully."

She added: "It was a dream of mine. I like the official-ness and the family-ness of it all, having the same name and making decisions together."

The rock star also previously said that starting a family solidified her bond with Rossdale even more.

"You have to work at it, but actually, it's fun to get to this point," she told Vogue magazine in 2012. "Having kids takes the whole relationship to another place. It is the ultimate collaboration. Both of us have such strong opinions about how it should be, and it's really fun to do it together."

Tags: Gwen Stefani