Just a few weeks after seeking help for an anxiety issue, Chynna Phillips has successfully completed her in-patient treatment. "Chynna is excited to be back with her kids and to celebrate her oldest child's birthday," a spokesperson for the singer says. The singer, who checked into an undisclosed facility last month and returned home on February 26, joined daughter Jamieson for her 10th birthday party the very next day. Chynna's actress sister Mackenzie is not worried about the Wilson Phillips star. "She is so very strong and funny. She is going to be just fine, I know it," fellow rehab-alum Mackenzie told In Touch when Chynna announced her admittance into rehab on February 15. The blond beauty has three children with actor husband Billy Baldwin.