Leave it up to Lilo to start drama with another Hollywood starlet!

Lindsay Lohan guest hosted the Aug. 5 Chelsea Lately episode airing tonight, and the rehabbed redhead took a swing at Twilight star Kristen Stewart and her recent outburst at photographers.

Referencing X17online's exclusive video of K-Stew losing her temper with the paps, the Mean Girls star quipped, "I'm just excited that Kristen Stewart, you know, finally showed some emotion."

As if that wasn't harsh enough, she decided to cut a little deeper!

"I will say this, of course she hates photographers - they got a picture of her kissing a married man in a Mini Cooper," she joked. Ouch!

Let's hope these two ladies don't run into each other at Chateau Marmont, because there's bound to be a catfight!