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Ashton Kutcher, Boston Cap

FameFlynetUK/FAMEFLYNET PICTURES

Ashton Kutcher is wearing a Red Sox hat to show his support for Boston following Monday's fatal marathon bombings.

The 35-year-old donned the baseball cap while leaving his London hotel Tuesday morning with Mila Kunis.

Kutcher looked decidedly somber as he and his leading lady exited the hotel.

But just wearing the accessory wasn't enough.

Ashton Kutcher, Twit Pic

Twitter

The Two and a Half Men star posted a selfie with the snapback on his Twitter account to show his support for the city.

Monday's devastating attacks during the city's marathon have now resulted in three casualties and over 180 injuries, according to CNN.