Sienna Miller welcomes her first child!

It's a girl for Sienna Miller, 30, and her fiancé, Tom Sturridge, 26! 

Baby arrived over the weekend in London and, as a source for Us Weekly Magazine has confirmed, it's a girl!

No more deets yet from this very private couple.

Sienna and Tom (who's also a British actor) have been together for over a year. Rumours of their engagement sparked last February — upon sudden appearance of a sparkling engagement ring on the actress' ring finger. Despite rampant rumours of the pregnancy, Sienna didn't talk about it until last April, when she told British Vogue, she was "feeling fine.... It's all progressing nicely and it's very exciting."

Congrats to the family!
xo Haley-O