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Sienna Miller, Tom Sturridge

Harold David S. / Splash News

Sienna Miller and Tom Sturridge are new parents to 4-month-old Marlowe, but that doesn't mean they don't make time for just the two of them.

On Thursday, the 30-year-old actress and her 26-year-old fiancé held hands in NYC during an adults-only day date. While the doting duo have been lying low since the birth of their little daughter, they took the opportunity for some quality one-on-one time with each other.

Just recently the supercute new parents shared a smooch over breakfast in London with baby Marlowe in tow.

Could their little family be any cuter?!