The former member of '90s pop group Wilson Phillips entered the facility over the weekend.
"After much thoughtful deliberation Chynna Phillips has checked herself into an undisclosed treatment facility for anxiety," her manager, Lizzie Grubman, told Access. "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, is married to "Gossip Girl" star Billy Baldwin. They have three children together.
She is also the half-sister of Mackenzie Phillips, who came forward with shocking claims of a sexual relationship with their father, John Phillips, last year.
Both sisters appeared together on an episode of "The Oprah Winfrey Show" following the claims to talk about the scandal and the impact on their family.
"I pray that we all get closer through this crisis," Chynna said at the time. "But I would be lying to you if I didn't tell you that there are going to be some huge obstacles in front of us."
Chynna released the album "One Reason" with singer/songrwriter Vaughan Penn in September 2009.
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