In February, I made a mini not-so-OT post about TomStu and Sienna expecting their first baby and now the little bundle of joy has arrived according to USMag

" And baby makes three! Sienna Miller and her fiance Tom Sturridge welcomed their first child over the weekend in London, a source confirms exclusively to Us Weekly. Details on the baby's gender, name and weight were not available. The British duo have been dating for over a year and debuted signs of their engagement -- Miller's dazzling diamond engagement ring -- in mid-February. "

Congratulations to Tom and Sienna! Cute Britpack baby! Aww Uncle Rob and Aunt Kristen. :)

According to celebdelacream Sienna gave birth to a baby girl. via @victoria1985

Sienna's sister, SAVANNAH_MILLER tweets "Marlowe I love you....."
And her full name via GraziaDaily UK  is Marlowe Ottoline Layng