Chynna Phillips has entered a rehab facility for anxiety.
"With the full support of her family and friends, she is looking forward to her recovery," said her publicist, Lizzie Grubman, who didn't disclose the location. "We ask that people respect her and her family's privacy at this time."
Mackenzie Phillips' family split over star's incest claims
The Wilson Phillips member is the half-sister of Mackenzie Phillips, who last fall claimed to have had an incestuous relationship with their late father, John Phillips. While Chynna's mother, Michelle Phillips, says she does not believe the claims, Chynna has publicly supported Mackenzie.
"I knew it was true," said Chynna Phillips, who has three children with husband Billy Baldwin. "I mean, who in their right mind would make such a claim if it wasn't true?
Chynna Phillips on Oprah: Who would lie about having sex with their father?
As half of the Christian pop duo Chynna & Vaughan, the 42-year-old singer released an album, One Reason, in September, a day before Mackenzie's claims were made public.