Sienna Miller is officially a mom!

Actress Sienna Miller had her first child! Miller and her fiancé, Tom Sturridge, welcomed their brand new baby this weekend.

According to Us Weekly, Miller and Sturridge have been dating for over a year and the first signs of an engagement were seen in February.

During the course of her pregnancy, Miller remained silent about baby details. The gender, weight, and name remain unknown.

The 30-year-old actress doesn’t plan to be revealing information anytime soon. Miller said, “I'm under strict instructions not to say anything as it would completely defeat the point of everything I've tried to achieve in the last eight years."

E! Online reported that back in March, Miller opened up about the pregnancy, saying, “I'm feeling fine…It's all progressing nicely and it's very exciting."

Miller is best known for her roles in Alfie and Factory Girl. She is also known in the fashion community. Miller founded her own label called twenty8twelve, from which she and fellow fashion designing sister Savannah have since stepped down.

Sturridge is also an actor. He starred in Pirate Radio and Waiting for Forever.