Prince Harry is thought to be fearing his “new happiness” with wife Meghan Markle could be ruined as the couple face what could be another blow.

The Duke and Duchess of Sussex may be feeling the heat as a new documentary threatens to reveal “explosive” details about their past lives. The royal pair, who are no strangers to controversy since stepping back from working Royal duties, are understood to be concerned about what this upcoming programme could expose.

The documentary is being crafted by seasoned Royal journalist and German TV producer Ulrike Grunewald, who has journeyed to California with her team to delve into the Montecito lives of Harry and Meghan. Among those contributing to the documentary is Richard Mineards, a former UK Royal correspondent now residing in Meghan and Harry’s Californian neighbourhood. In his recent column, Mineards revealed, “Los Angeles-based producer Melanie Hillmann grilled me for two hours on my Riven Rock neighbours, Prince Harry and Meghan Markle, under director Ulrike Grunewald.”

Despite their claims of valuing privacy, the Sussexes might be feeling uneasy about the potential revelations this new documentary could unearth. A source suggests there could be a sense of “worry” or even “panic” within the Sussex camp, a common reaction when a new documentary is on the horizon.

Get more of the latest Royal news from the Mirror

Meghan is reportedly ‘worried’ that an upcoming German documentary will explore her first marriage to producer Trevor Engleson ( 
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Harry and Meghan’s ‘focus’, a source says, was their Nigeria trip ( 
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REX/Shutterstock)
The insider revealed: “There are many things that both of them, especially Meghan, don’t necessarily want in the public domain. It’s no secret that they both led colourful lives before they met each other, and while Harry has spoken about a lot of mistakes in his book, there are still things about Meghan we don’t know”, they tell OK!.

Meghan, of course, had a life before she became Prince Harry’s wife, and was a familiar face on the Hollywood party circuit. The insider alleges that there are aspects from her past that she’s “brushed over” but there are individuals out there “willing to speak out”.

Regarding what other parts of Meghan’s history might be scrutinised, the insider tells OK!: “It could also delve deeper into her fall-out with Kate and challenge the Sussex camp narrative that it was all Kate’s fault. But Harry and Meghan are now desperate to leave everything in the past as they want to start afresh and I think Harry will fear that their new happiness could be ruined if Meghan’s past is investigated.”

READ MORE: Prince William and King Charles want key thing ‘made clear’ about Meghan and Harry Nigeria trip