British actress Sienna Miller has just stepped into the role of her life.
The 30-year-old gave birth to a daughter in London over the weekend.
Shortly after, her fashion designer sister Savannah tweeted: "I love you Marlowe", confirming the baby's name.
Marlowe is the first child for Sienna and her partner, 26-year-old actor Tom Sturridge who began dating the Alfie beauty shortly after her split from Jude Law in 2011.
One year on, rumours began to circulate that the couple were expecting.
Sienna confirmed the good news to British Vogue in March, saying: "I'm feeling fine. It's all progressing nicely, and it's very exciting".
The new mum will be relying on her loved ones for some maternal advice and support.
Big sister Savannah is already a mum-of-three, and will be able to guide her famous sibling through those first tentative steps of parenthood.
It's a little princess!