Sienna Miller shares first photos of new baby.

The British actress posted a slideshow of images on Instagram on Wednesday chronicling her life over the last two months. To begin, Sienna uploaded a snap of her sitting surrounded by pillows while heavily pregnant, before adding an adorable image showing her cradling her third child while in a hospital bed. She also posted a black-and-white photo of her fiancé, Oli Green, appearing emotional while holding the baby, whose face was concealed. "Adulting," the 44-year-old wrote in the caption. Sienna and actor Oli, 29, started dating in late 2021 and welcomed their first baby together, a daughter, in December 2023.