After a late-night celebration with the king to commemorate his milestone on Tuesday, Prince William and Princess Kate were all smiles and in good spirits as they left King Charles’ birthday reception.

The Prince and Princess of Wales were seen beaming from ear to ear as they emerged from their luxury car after attending a midnight celebration, looking stunning in their elegant costumes and smiled from ear to ear.

The 41-year-old Princess was wearing an emerald, sequin-embellished gown as she sat next to her husband, Prince William, in their car.

William, the heir to the throne, on the other hand, looked smart in a fresh white shirt and black jacket. The couple’s romantic mood indicated that they were preparing something significant for the future.

Princess Beatrice, Princess Margaret’s daughter Lady Sarah Chatto, and Princess Anne’s daughter Zara Tindall, as well as her husband, former rugby player Mike Tindall, joined the royal party.

The reception was also attended by Tom Parker-Bowles, Queen Camilla’s son from her first marriage. The huge royal function, however, was absent Prince Harry.

According to sources, the phone chat that broke the father-son duo’s months-long ice went so well that Charles and Harry have scheduled another over-the-phone catch-up for next week, which could be a “turning point” in their relationship.

According to sources, King Charles got a pre-recorded video of his grandchildren, Prince Archie, four, and Princess Lilibet, two, singing Happy Birthday to him.

Prince Andrew, his ex-wife Sarah Ferguson, and their youngest daughter Princess Eugenie, who remains close to Harry, were not seen attending the King’s ceremony.