These Celebrity Sisters Are Nearly Unrecognizable in Childhood Photo: Who Are They? (PHOTOS)

We were shocked at how different Hilary and Haylie looked back in the day, but there’s no denying that they were adorable.

Hilary, who now has an 8-month-old son named Luca,  tweeted this for Throwback Thursday yesterday, and though she didn’t provide any commentary about her rockin’ butterfly headband, we’re sure that accessory inspired her 2003 debut album, Metamorphosis.

Did you know it was the Duff sisters? Tell us below, and then click here to play more “Guess Who?”