Penelope Scotland Disick isn't the only baby girl with famous parents who made her debut this past weekend! 
 
 As Us Weekly reported on Sunday, Sienna Miller and her fiance Tom Sturridge welcomed their first child over the weekend in London — and a source now confirms to Us that the bundle of joy is a girl! The British actors have been dating for over a year and debuted signs of their engagement — Miller's dazzling diamond engagement ring — in mid-February. 
 
 PHOTOS: Sienna's chic bump style 
 
 After remaining mum about her pregnancy for several months, the G.I. Joe: The Rise of the Cobra actress, 30, finally opened up to British Vogue in April. 
 
 "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," the resolutely private Miller (who famously dated Jude Law) expressed to the mag. "I'm feeling fine…It's all progressing nicely and it's very exciting." 
 
 PHOTOS: More pregnant celebrities 
 
 Despite the couple's silence about their new addition to their family, Miller and Sturridge, 26, made no hesitation in stepping out in public on several celebratory occasions. 
 
 PHOTOS: Incredible post-baby bods 
 
 In May, the couple stole some time away in Portofino, Italy for a babymoon. A week later, they got decked out to celebrate Sturridge's BFF Robert Pattinson's 26th birthday at Gordon Ramsey's restaurant in London, England. 
 
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 Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now! ||||| With the arrival of their second child,andmust certainly be over the moon with joy. New additionmay be second in line to older brother, but she is the famous couple’s first little girl. 
 
 Given daddy Disick’s affection for his little man, it stands to reason that his new baby girl will be showered with love. 
 
 Take a look back at some of his best daddy moments with Mason and Scott in the gallery. 
 
 In fact, the the 29-year-old restauranteur has made such an impression on his son that he’s even passed on his impeccable fashion sense. 
 
 He may be only 2-years-old, but tiny tyke has a wardrobe that rivals even the best dressed celebs. See some of Mason’s styles below. 
 
 Mom Kourtney is quite the fashionista herself, of course. 
 
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 No changes are to be made to this player ||||| Let's say hello to Penelope Scotland Disick. 
 
 "Scott and I are overjoyed to welcome our precious angel Penelope Scotland Disick into our lives. We are forever blessed. Mommy and baby are resting comfortably," Kourtney tells E! News. 
 
 The 33-year-old E! star had an all-natural birth, and her new mini-me tipped the scales at 7 pounds, 14 ounces. 
 
 "It was a great. She had an easy delivery," matriarch Kris Jenner tells us. "[Penelope] is so cute. She looks just like Mason. She's so beautiful. We are so happy." 
 
 As it happens, this has been one highly anticipated birth (complete with a headline-grabbing false alarm), and not just among the fans. 
 
 Kourtney and Scott announced the news of the impending stork delivery last November, and revealed that they were expecting their first daughter in February of this year (son Mason turned the big 0-2 in December).
– Oh joy: The world finds itself with yet another Kardashian. The daughter of Kourtney and partner Scott Disick arrived yesterday, and the couple is "overjoyed" and feels "forever blessed," Kourtney says in a statement to E!. Penelope Scotland Disick joins older brother Mason, 2, after an all-natural birth that Kardashian mom Kris Jenner says was "easy." Need more? Though we find it hard to believe anything Scott Disick does can accurately be described as "cute," feel free to click on to some of his allegedly adorable daddy moments. Kardashian wasn't the only celeb mommy giving birth this weekend: Sienna Miller also welcomed a baby girl, her first child with fiancé Tom Sturridge, Us reports.