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Sienna Miller

ACE/INFphoto.com

Who says 9 months old is too young to voice an opinion?

Sienna Miller was spotted on the streets of New York City with her baby daughter, Marlowe, whose stroller was decked out with a sticker promoting marriage equality.

Which, of course, was probably mom's doing, but still!

Sienna and Marlowe join numerous Hollywood celebs in supporting gay marriage, including Beyoncé, Kim Kardashian Padma LakshmiKate WalshFelicity Huffman and Jessica Seinfeld, just to name a few. 

And, when there's no car around to afix a bumper sticker to, what better mode of transportation than your little one's stroller to get a message across?