One of Kate Middleton and Prince William’s pals and the go-to designer behind many of the looks worn by their children Prince George, Prince Charlotte, and Prince Louis is worried about the royal couple as the Princess of Wales undergoes cancer treatment, RadarOnline.com has learned.

“I’m heartbroken at the moment. I think they are going through hell,” Amaia Arrieta told The Telegraph. “I hope they will be back. It’s really personal.”

SOURCE: MEGA

Prince William plans to serve as an usher at the wedding, while his wife, Princess Kate, is unlikely to attend due to her cancer battle.

“Dressing the royals gives me so much pride, I really do care about how they look,” she said. “The first time I realized Prince George was wearing my designs, I was in Waitrose and saw the picture of him on the cover of Hello! magazine. That was a huge moment because they had been coming to us, but you never know if they’ll actually wear it.”

Arrieta has been dressing Prince George since he was a 𝚋𝚊𝚋𝚢 and works closely with the Wales’ team on outfits for special occasions including birthdays, weddings, and Christmas Day church services. “It’s often a very tight deadline,” she added. “We would do anything for them…the children always look amazing in the end.”

Arrieta was thrilled when she saw the Mother’s Day family photo posted by Middleton earlier this year and noticed that Princess Charlotte, who celebrated her 9th birthday on May 2, was wearing a checked skirt from her childrenswear label, Amaia London.

But that same photograph proved a source of controversy after it was pulled by several major news agencies due to suspicions that it was “manipulated” by Kensington Palace, leading to further speculation about Middleton’s health and whereabouts.

“Like many amateur photographers, I do occasionally experiment with editing,” Middleton wrote in a statement soon afterwards. “I wanted to express my apologies for any confusion the family photograph we shared yesterday caused.”