Hilary Duff tattoo sweats boxed water married ponytail

Hilary Duff tattoo sweats boxed water married ponytail

We've never seen that one before!

Hilary Duff showed off her newest tattoo while out and about in LA, and we have to admit, it keeps us guessing. The phrase "Thick As Thieves" is scrawled on her left hand so it could be a private phase she shares with new hubby Mike Comrie (she wears her wedding band on her left hand after all) or a joint tattoo with her sister ... or mom!

Duff currently has two other tattoos ... that we know of. The ex-Disney star took her mom along for her first tattoo, which says “Let it be” in simple English on the outside of her right ankle. The Material Girls star once told In Touch of her ink-y text:

    "I have a hectic, crazy life. Things are so crazy around me and I get stressed out. It’s like, I’m just one person so, let it be."

Mrs. Comrie's second tattoo, “ma petite amie”, is a French saying with two meanings: one being ‘my little friend’, and the other, ‘my girlfriend’. The ink is located on her right side just under the singer's chest, and is reportedly for her sister, Haylie Duff.

Is the Duffster on her way to becoming the next Kat Von D? We kid.

Find out who's infamous shoes HiIl is gearing up to fill, after the jump ...