The Palace has confirmed this news. It has also been revealed that Prince Harry will be seated 10 rows behind the Royal family at the ceremony.
Paul Burrell, the former butler of Princess Diana, has stated that Prince Harry is content with being seated in the tenth row as it will allow him to make a swift exit. Burrell has also claimed that a reconciliation between Prince Harry and his elder brother, Prince William, or the new monarch is highly unlikely.
Burrell added that Prince Harry's attendance at the event is not a surprise and he is doing so to make an appearance on his father's special day. He is expected to leave immediately after the ceremony to return home to attend his son's fourth birthday party.
Burrell stated that Prince Harry does not want to spend much time with the Royal family and he is likely to receive a cold reception from them. He will not even be able to see his father or brother, as he will be seated too far back. Overall, Prince Harry's presence is seen as a way to maintain good relations with his father, but a reconciliation seems unlikely at this time.