Rumer Willis on pal Lindsay Lohan's side

Bruce Willis and Demi Moore's daughter Rumer Willis, says she's on pal Lindsay Lohan's side.

"I haven't talked to her, but I wish her the best," Willis, 18, told PEOPLE at Thursday's BlackBerry Curve launch party in L.A. "I think there a lot of people that are supporting her. It's been kind of a crazy week, figuring it out, and figuring out a better way to be."

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"I think it's definitely hard growing up in L.A. with all of the things that you have to deal with, and being so young," Willis said. "I think sometimes people don't realize the amount of pressure that can come."

"She's great, she's a really cool person," Willis said of DJ Samantha Ronson. "She doesn't give a crap about what anybody else thinks about her, which I really respect."

Lohan was charged with DUI after her Mercedes crashed in Beverly Hills around 5:30 Saturday morning.