Paris Hilton says she will not appeal against her 45-day jail sentence for violating probation on a driving ban.
Hilton was distraught when she was sent back to jail
The celebrity heiress said she was "learning and growing" from her ordeal.
She is being held at a detention centre in Los Angeles, where she was believed to have undergone medical and psychiatric tests.
On Friday a judge ordered her back to jail, ending a brief stint under house arrest at her Hollywood Hills home. She was taken screaming from the court.
In a statement released by her lawyer on Saturday, the 26-year-old said: "Being in jail is by far the hardest thing I have ever done.
"During the past several days, I have had a lot of time to think and I believe that I am learning and growing from this experience."
Her lawyers had sought to keep her out of jail on grounds that she was suffering an unspecified medical condition.