Prince Harry has reportedly revealed he has been in therapy for the past few years coping with the loss of his mother.
The admission came during his first event with his wife Meghan since announcing they will leave the British royal family.
In a speech at a JP Morgan- sponsored alternative investment summit in Florida, Harry also said he did not regret stepping down as a senior royal, as he did not want Meghan and son Archie to experience what he went through when he was younger.
It is not known if Harry - who in a decision dubbed Megxit chose financial freedom over being a member of the monarchy - was paid for the speaking engagement.
However, speculation is rife that he could have received a fee worth several hundred thousand euro.
The New York Post reported Harry attended the event in Miami on Thursday and quoted a source as saying: "Harry spoke about mental health and how he has been in therapy for the past few years to try to overcome the trauma of losing his mother.
"He talked about how the events of his childhood affected him and that he has been talking to a mental health professional.
"Harry touched on Megxit, saying that while it has been very difficult on him and Meghan, he does not regret their decision to step down as senior royals because he wants to protect his family.
"He does not want Meghan and their son Archie to go through what he did as a child."
In 2017, the 20th anniversary of Princess Diana's death in a Paris car crash, Harry also spoke about how he had sought counselling after two years of "total chaos", having spent nearly two decades "not thinking" about the death of his mother.
Details have not been released about why the couple attended the summit, but a number of charitable organisations have been featured at the event, staged at the 1 Hotel in Miami's South Beach.
A Buckingham Palace spokeswoman said: "I can confirm reports the Sussexes attended a JP Morgan gathering in Miami yesterday, where the Duke spoke."
The couple are living in Canada with their baby son, Archie Mountbatten-Windsor, as they prepare to drop their HRH styles and quit the monarchy in favour of financial freedom.