Prince William and Princess Catherine were among the royals who attended a service celebrating Commonwealth Day. The couple shared several special moments during their appearance, sparking various theories among netizens.

On March 10, 2025, the British royals gathered in London at Westminster Abbey for the annual Service of Celebration for Commonwealth Day. At one point, Prince William, who attended with his wife, Princess Catherine, appeared to whisper something to her at the start of the ceremony. This action, and others, prompted mixed reactions from viewers.

Prince William whispering something to Princess Catherine while standing behind King Charles and Camilla, Queen Consort, during the annual Service of Celebration for Commonwealth Day on March 10, 2025 | Source: YouTube/BBC

For the occasion, William wore a navy suit with a white shirt and a maroon tie. His wife looked stunning in an all-red ensemble, wearing a red coat with tie details that resembled a bow when fastened, along with a matching hat and dress.

Prince William covers his mouth while whispering something to Princess Catherine | Source: YouTube/BBC

At the beginning of the event, William seemed to cover his mouth or touch it while turning to speak to his wife. His hand was balled into a fist as if he were coughing while whispering to the princess, who smiled and responded.

A publication had a different perspective on the couple’s interaction, speculating that the prince had shared a joke with his wife. The Royal Family Channel also shared a YouTube clip highlighting various moments between the prince and princess.

The pair was seen greeting and conversing with Commonwealth leaders and VIP guests. They were also recorded singing hymns and participating in the ceremony. Social media users couldn’t resist focusing on the couple during the event.

Princess Catherine and Prince William at the celebrations for Commonwealth Day on March 10, 2025, in London, England | Source: Getty Images

Seeing the Royal Family Channel clip, someone noted, “They both look so happy together. Catherine looks radiant.” One netizen shared a short clip of William speaking to Catherine while standing behind King Charles and Queen Consort Camilla.

They theorized what the couple was doing, writing, “Look at these two flirting in public… [sic].” In response to the post, another fan commented, “Haha, I spotted him whispering behind his hand too! He didn’t want anyone knowing what he was chatting about!”

Prince William chatting to Princess Catherine as they depart after attending the 2025 Commonwealth Day Service | Source: Getty Images

After seeing a photo of the couple laughing while seated at the event, one person praised them. The fan said, “This is really lovely, both enjoying themselves.” Someone else remarked, “Such a happy couple – no fakeness at all – pure joy makes me happy.”

Prince William and Princess Catherine look happy at Westminster Abbey | Source: Getty Images

Another observer also noticed the love between the pair. The person shared a picture of the couple looking at each other while exiting the abbey and wrote, “The way Princess Catherine and Prince William still look at each other after all these years… a beautiful couple [sic].”

Someone who saw various pictures of Catherine and her husband at the service noted, in part, “Lovebirds, after all these years, still flirting At today’s annual Commonwealth Service.” Another netizen who saw the couple standing side by side while singing couldn’t help but praise them.

They said, “William and Catherine unconsciously synchronising [sic] with each other at the Commonwealth Day Service Eyes up, eyes down at the same moment – I love this love of theirs, may it find us all.”

As previously reported, as William and Catherine stepped out for the annual Commonwealth Day Service, a brief exchange between the couple was captured on video. Now, a lip reader claims to have decoded their private conversation, offering a rare glimpse into their candid moment.

Princess Catherine and Prince William attend the celebrations for Commonwealth Day at Westminster Abbey on March 10, 2025 in London, England | Source: Getty Images

As expected, body language experts closely observed Catherine’s demeanor. Every gesture and expression was analyzed as she moved under the public’s watchful gaze.

One moment, in particular, caught the attention of a lip reader. A brief exchange between Princess Catherine and Prince William as they approached the venue quickly circulated on social media.

In a short video clip, Catherine appeared to turn toward someone on her left and say, “Thanks.” She then faced Prince William and commented on the celebration, reportedly saying, “So lovely.” William, ever composed, is said to have responded with a simple remark, “Not bad, right?”

The exchange, though subtle, has sparked interest among royal watchers, offering a glimpse into the couple’s private conversations during the high-profile event. As the Commonwealth Day celebrations unfolded, the royal couple remained at the center of attention, their presence reinforcing their role within the monarchy.

Princess Catherine’s appearance at the 2025 Commonwealth Day Service carried special significance. Just a year earlier, she had been absent from the same event due to health concerns, leaving Prince William to attend alone. Her absence raised questions among royal watchers as speculation grew about her condition.