What Do All of Hilary Duff's Tattoos Mean?
Hilary Duff Has Far More Tiny Tattoos Than You Might Realise — Each With a Special Meaning
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The inside of Duff's left arm has the phrase "Thick as Thieves" in script. She told Ellen Degeneres on her show in 2015 that it's a matching piece of ink with her sister, Haylie. While we don't know what year she got it, it is one of her older tattoos.