Sienna Miller gives birth (Photo : Flickr)

UPDATE: Penelope Scotland Disick isn't the only new girl in town; Sienna Miller gave birth to her daugther, Marlow.

US Weekly reports that Sienna Miller, 30, and her fiancé Tom Sturridge, 26, gave birth to their first child over the weekend in London. Specifics on the baby's gender, name, and weight are not revealed as of yet.

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The British couple have been dating for more than a year and are reportedly engaged. Miller has been spotted flaunting a diamond engagement ring earlier this year in February.

The private couple has even kept the pregnancy secret from the press for several months until Miller finally revealed her good news to British Vogue in April:

"I'm in my second trimester, so I'm I-can-talk-about-it pregnant. Even though 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. I'm feeling fine...It's all progressing nicely and it's very exciting"

It was only a matter of time before the world would find out about the newest celebrity baby.