After serving 23 days in jail last year, socialite Paris Hilton promised to become a better person.

It looks like Paris may be fulfilling her promise, as the 27-year-old has made an "extremely generous" donation toward the construction of a medical building at Childrens Hospital Los Angeles, hospital officials said Thursday.

The hospital did not specify how much the heiress donated.

Hilton released a statement saying, "The children I have met through my involvement with Childrens Hospital have truly touched my heart. I am proud to make a donation and lend my name to the fundraising effort to help children who are facing terribly serious illnesses."

The 460,000-square-foot Childrens Center for Cancer and Blood Diseases is expected to open in 2010.

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