Hilary Duff used to destroy her sister Haylie's underwear.
The 'Stranger' singer has revealed she fought constantly with her older sister - who is now launching her own music and acting career - and would often play cruel tricks on her.
Hilary told Top of the Pops magazine: "If Haylie had friends over to stay when we were little, and they left me out, I'd freeze their underwear!
"I'd wet the knickers, put them in the freezer and snap them to ruin them.
"Whatever I did, Haylie always got me back. Older siblings know how to be good fighters - when you're younger you just hit back. I'm sure there were a couple of flying hairbrushes.
"When Haylie and I were really young and we played games together - she'd always make me pretend to be a boy because I had short hair. I hated it!"