Princess Kate dazzled at Trooping the Colour on Saturday, June 15, but the Princess of Wales' return to the spotlight wasn't easy. The Princess of Wales took a step back from duties to focus on her health after being diagnosed with cancer, but the mom-of-three still managed to attend the gathering.

"The princess has this sort of swan-like quality about her — she's sort of gliding on the surface — but beneath the water, I think often she's paddling quite frantically. I can only imagine that a huge amount of preparation and time and effort and energy will have gone into Saturday's appearance,” Katie Nicholl told Entertainment Tonight.

"She was on her feet for a long period of time. There was a moment where she was watching the parade... and was offered a seat, which she gratefully accepted. That's just a bit of an acknowledgment that she is not as strong, not as fit, as she was before she went into this treatment,” she continued.

However, Princess Kate revealed in an Instagram post that she sometimes feels "weak and tired" while having chemotherapy. Despite this, she is concentrating on her recuperation.

"I think a day like Saturday, where she knows the eyes of the world are on her, there is a huge amount of scrutiny that will take its toll. I think we can probably imagine that she probably had a long and well-deserved rest afterward. I don't think we can expect to see her in public for a little while. That's going to take some recovery from,” the royal author went on.

Despite the fact that fans were thrilled to see Princess Kate in attendance, the wife of Prince William is not in a hurry to return to her job, as per OK Magazine.

"There was no pressure on her from anyone. She really wanted to do this. She turned a corner in her treatment... When she turned that corner, I was told that Trooping was a goal for her. She was given the sign-off by her medical team. She spoke to her father-in-law about attending and to Prince William. They were fully behind her,” Katie stated.

"Charles has been a great pillar of support to Catherine when she said that she'd really like to be there at Trooping. He was 100 percent behind it. The idea that she was going to upstage him didn't even cross his mind. He just wanted his daughter-in-law by his side,” she furthered.

During the time that she was waving to fans, Princess Kate was able to be a soothing presence for her three children, Prince George, Princess Charlotte, and Prince Louis.

"I think she felt very much that she needed to be there. The children looked so happy and relaxed having their mother there... It was important, I think, for the Princess of Wales to be there to support her father-in-law, to be there for her family, and to be there for the nation to send out a really important message that she's doing OK,” Katie said.