Harry Potter author JK Rowling says the Half-Blood Prince is now completely finished and is her favourite so far.
But there was some bad news for fans as well, as JK said she's planning on having a break before picking up her pen to write the final Potter book.
JK said she likes the Half-Blood Prince more than any of the other books when she had just finished them.
The author added she was taking a break from writing to spend more time with her new baby daughter Mackenzie.
JK added that although she would be itching to start writing the seventh book, she wouldn't be doing any sustained writing on it yet.
Harry Potter and the Half-Blood Prince is the sixth book in the series, and is out on 16 July 2005.