Unfortunately, any actor or actresses's email address or telephone number is personal, so you will not be able to get hold of that information.
However, there are fansites that you can visit, where you can talk to other fans of Leonardo Dicaprio. The owners of the site may have some idea of where you can write to him.
Here's Leonardo's official website: www.leonardodicaprio.com.
There are videos of his appearances on Oprah available on Youtube, although these may not be the ones you are searching for. Try visiting Youtube and entering "Leonardo Dicaprio Oprah" in the search box.
If you still cannot find it, then try visiting this website: http://simplyleonardodicaprio.com/. This is a huge fansite dedicated to Leonardo and has hundreds of pictures and videos of him.
Hope this helps!
However, there are fansites that you can visit, where you can talk to other fans of Leonardo Dicaprio. The owners of the site may have some idea of where you can write to him.
Here's Leonardo's official website: www.leonardodicaprio.com.
There are videos of his appearances on Oprah available on Youtube, although these may not be the ones you are searching for. Try visiting Youtube and entering "Leonardo Dicaprio Oprah" in the search box.
If you still cannot find it, then try visiting this website: http://simplyleonardodicaprio.com/. This is a huge fansite dedicated to Leonardo and has hundreds of pictures and videos of him.
Hope this helps!