Sienna Miller: 'W' Baby Bump Arrival!

Sienna Miller shows off her growing baby bump as she arrives at W magazine and P&G Prestige’s cocktail reception on Tuesday (February 14) at the Park Avenue Armory in New York City.

The 30-year-old English actress wore a slimming BOSS Black dress and accessorized with Pamela Love jewelry – Sienna is the fragrance ambassador for Boss Orange!

PHOTOS: Check out the latest pics of Sienna Miller

Sienna is currently expecting her first child with fiancé Tom Sturridge, Us Weekly reports – the two have been dating for a year.

10+ pictures inside of Sienna Miller arriving at the W party…