Do NOT Mess With The Duffster!

First that MileyBird, and now HER, too?!

First lesson for the paparazzi: DO NOT mess with those Disney starlets!

Hilary Duff unleashed on one particularly pushy photog following her into her El Lay home yesterday, and walloped him with her purse when he got a little too close for comfort!

Check out the video (above)!

Good for you, gurl! These guys need to know their BOUNDARIES!

You ROCK!

And he clearly had it coming – especially after he mocked her at the end!

Seriously – not cool! They need to back off!