As the May 6 coronation of King Charles III approaches, tensions and drama rise behind the scenes of the historic event at London's Westminster Abbey.

The coronation, a rare spectacle, is full of secrets and surprises, with some being welcomed and others causing ripples within the royal family. "It's meant to be a celebration, and it will be," says a palace source, "but there has also been drama behind the scenes."

A major point of speculation has been Prince Harry's attendance. After years of strained relations and his recent controversial memoir, many wondered if Charles' youngest son would attend the coronation. The Duke and Duchess of Sussex announced that while Harry, 38, would attend, Meghan Markle, 41, would remain in California with their children, Prince Archie and Princess Lilibet.

This decision has sparked controversy within the royal family. "Charles invited Meghan to the coronation. It was somewhat of an olive branch after the damage she and Harry have caused with their tell-alls," says the source. "And what did he get in return? A slap in the face. Meghan is snubbing the invite."

Harry's role in his father's big day has also raised eyebrows. While William and his son, Prince George, will have key roles in the coronation, Harry will only observe the ceremony. However, the source reveals that "he was invited to be on the balcony at Buckingham Palace afterward with the rest of the family."

Kate Middleton will also have a prominent role in the coronation, which has reportedly caused tension between her and Camilla. The source explains that the two women "have a love-hate relationship. Camilla is jealous because Kate's more popular and was beloved by the late queen."

Guest list drama has also emerged. While David and Victoria Beckham, Daniel Craig, and Hugh Grant are expected to attend, other high-profile figures such as U.S. President Joe Biden and various performers have declined invitations to the event.

Despite the challenges, Charles and Camilla are focused on enjoying their big day. "Ultimately, the coronation is all about celebrating and coming together," says the source. "There's been enough drama already — no one wants any more."