Prince Harry watches Meghan on stage: Inside the exclusive 'ultimate girls' retreat'

Prince Harry and Meghan Markle's whirlwind visit to Australia wrapped up last night, with the Duke and Duchess of Sussex expected to jet back to LA today.

But their final day in Sydney on Friday was jam-packed with engagements including what perhaps was the biggest event on their calendar - Meghan's headline appearance at the exclusive, "no-phones allowed" Her Best Life Retreat.

The event was a real test to their new funding model after stepping away from life as senior working members of the royal family, with about 300 people paying upwards of $2699 to attend the In Conversation.

The quasi royal tour was their biggest experiment yet in managing philanthropic pursuits with business opportunities to help pay for their independent lifestyle and security bills.

Meghan spoke on stage at the five-star InterContinental Coogee Beach hotel with Her Best Life podcast host Gemma O'Neill, Jackie O's best friend and manager, who was behind the two-day event.

In photos shared by the podcast on social media, the two women were seen laughing as they chatted away, with Prince Harry seemingly watching on from the audience.

The pair also were seen grabbing each others hands as they talked.

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They also posed on stage for photos, with the duchess wearing a monochromatic look in various shades of taupe, harking back to her time as a royal when she largely wore neutral tones.

Ready for business, Meghan donned pants with a sleeveless pussybow blouse and pointed-toe heels.

Meghan accessorised the look with gold jewellery and appeared to be wearing the late Princess Diana's Cartier Tank Française watch.

This was layered with a diamond tennis bracelet and a Cartier love bangle, which is a combo - believed to be wedding gifts from Prince Charles and Prince Harry, respectively - the mum-of-two is often seen wearing.

The Duchess of Sussex was also seen wearing her $24,300 nail-style choker, the same Cartier Juste un Clou necklace she regularly wore during the filming of her lifestyle show With Love, Meghan.

The retreat was billed on its website as "an unforgettable weekend for women ready to reconnect, recharge and have some serious fun".

Event staff gathered in the hotel's reception as the venue welcomed guests to the exclusive retreat and there was extensive security at the hotel for the duchess' visit, according to the Press Association, who added that media access to the event was strictly limited.

In addition to Meghan's appearance, the retreat also included a "women's coaching session with renowned therapist Dr Justine Corry, yoga, sound healing, time by the pool, lunch, beautiful dinners and a dance-floor-filled disco night".

The Duchess of Sussex wasn't the only one to appear at a conference-like event during the four-day non-royal tour.

The Duke of Sussex also gave a keynote speech at a summit on leadership in the workplace in Melbourne on Thursday.

Delegate tickets were originally priced at $1978 but they ended up being slashed by 50 per cent to around $997, with platinum tickets going for just under $2400.

They also had a virtual ticket allowing on-demand access to Harry's speech costing $498, with proceeds from all ticket sales going to Lifeline Narrm's 24/7 crisis support services in Victoria.

Although, Press Association reports that Harry was not paid a fee for his speech.

They also say Meghan was not paid for her appearance on MasterChef Australia, which she filmed in Melbourne on Wednesday but it's not known how much, if at all, she was paid for her appearance at the retreat on Friday.

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