The former member of pop group Wilson Phillips entered a rehab facility over the weekend for anxiety, reports People.
"After much thoughtful deliberation Chynna Phillips has checked herself into an undisclosed treatment facility for anxiety," her manager Lizzie Grubman said.
Grubman added: "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 is the half-sister of Mackenzie Phillips, who revealed last year that she had an incestuous relationship with her father John, a member of the band The Mamas & the Papas.