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Chynna Phillips

Jean-Paul Aussenard/Getty Images

Just when you thought the sad saga of the Phillips family couldn't get any worse…

Months after Mackenzie Phillips came forward to claim she was raped by Papa John Phillips, half-sister Chynna has entered rehab.

"After much thoughtful deliberation Chynna Phillips has checked herself into an undisclosed treatment facility for anxiety," publicist Lizzie Grubman said in a statement Monday to People.com. "With the full support of her family and friends, she is looking forward to her recovery. We ask that people respect her and her family's privacy at this time."

Chynna, 42, publicly supported Mackenzie when she made the media rounds last year for her shocking autobiography, High on Arrival.

Chynna, the wife of Gossip Girl's Billy Baldwin, admitted the revelation had put a terrible rift in the family, with both her mother, Michelle Phillips, and another of John's ex-wives, Genevieve Waite, accusing Mackenzie of making up the story.

Chynna has also struggled professionally of late. Her former chart-topping band Wilson Phillips hasn't released an album since 2004 and her latest project, One Reason, failed to make any noise on the charts when it came out last September.

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Did Mackenzie's bombshell make our list of Juiciest Scandals of 2009? Go see for yourself.