Whether she's your blood sister or BFF, a tattoo to celebrate and commemorate your sisterhood and friendship is a worthy investment of both money and dermal real estate. Sister tattoos range from truly sweet to silly; simple to straight up gorgeous. Check them out and perhaps let one or two of them inspire your own sister tattoo.

Image via @evitadinamita1972

Linked pinkies means you'll always be there for each other.

Image via @charlottebergmantattoo

There's no sweeter friendship than the one between sisters.

Image via @tattoo_ess

Don't mess around with a punk boss babe or her sister.

Image via @jehfsorpressa

How about a pair of simple matching rose tattoos with delicate "sis" stems?

Image via @rafaellatattoo