Singing star Susan Boyle has left the Priory and was "much happier", her brother said.
The Britain's Got Talent contestant was admitted to the London clinic following a breakdown after last week's final of the TV contest.
But it emerged that Ms Boyle, 48, from West Lothian had been allowed to leave after five days.
She was staying in a flat in central London her brother Gerry, 55, told GMTV. He said: "She's much happier. She's seems a lot more like herself."
Mr Boyle said Susan had spoken to people who had assured her it "wasn't the end" for her singing career after finishing second in the contest. He said: "Things are becoming clearer for her now. She's now beginning to believe that, 'yes indeed, I will be a singer'."
Boyle checked into the Priory clinic on Sunday after what her brother described as an anxiety attack. Police were called to Boyle's hotel over the weekend after she began acting strangely.
In the space of eight weeks, Boyle went from the quiet life of a church volunteer in a small town in Scotland to global fame. But she was beaten into second place by Essex dance outfit Diversity in a shock result last Saturday.
Reports claimed that following the programme, she shouted backstage "I hate this show" and threw a glass of water at a member of staff who tried to calm her.
TalkbackThames, which produces Britain's Got Talent, has said Boyle was "exhausted and emotionally drained" and was being offered "ongoing support".
Despite losing in the final, Boyle has been tipped to make millions from a singing career and bookies are already predicting a number one chart hit in America. Mr Boyle said he would be happy for Simon Cowell to manage his sister's career.