Mackenzie Phillips Doing 'Great' in Rehab

09/25/2008 at 10:30 AM EDT

Mackenzie Phillips Doing 'Great' in Rehab
MacKenzie Phillips
Fitzroy Barrett/Landov
One month after being arrested and charged with heroin and cocaine possession, Mackenzie Phillips is "doing great," her sister says.

"She's in recovery now, and we're so proud of her," Bijou Phillips told PEOPLE Wednesday night at the Manhattan premiere party of her new film, Choke at The Box in Manhattan. "This whole thing is the best thing that's ever happened for her. We’re so happy."

Mackenzie, 48, has long struggled with drug addiction and has checked into rehab several times. But Bijou, 28, who plays a milkmaid in the raunchy comedy (which costars Sam Rockwell and Anjelica Huston), is hopeful about Mackenzie's progress.

"I'm thankful that this happened and that we were able to do this," Bijou said. "It’s like we have our sister back."
Chris Willard

1981: Phillips and her dad kick their $1 million drug habit
See other stars who've battled addictions

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