The six-year-old will eventually get the title currently held by Princess Anne — the Princess Royal.
The appointment of the new colonel is decided by the regiment and Queen Elizabeth II.
The Duke and Duchess of Cambridge are parents to Princes George and Louis, and Princess Charlotte.
"The monarchy is in desperate need of reassuringly conventional royal performers" just like the Duchess of Cambridge.
The portraits do not show the duchess' appeal which is her "very down-to-earth approach combined with great style."
The Duke and Duchess of Sussex shared their birthday wishes with the celebrant via video call.
The picture made the Sussexes realise that they "would never really truly be the superstars of the British monarchy."
The Duke and Duchess of Cambridge "are reconciled to the fact" that their relationship with Harry "can't be put together."
The Duke of Cambridge faces a "poignant" reminder about his mother when the Duchess of Cambridge becomes Princess of Wales.
The Duchess of Cambridge turned 40 years old on Jan. 9.
All three of her portraits will be added to the permanent collection of the National Portrait Gallery, of which the Duchess herself is patron.
The photographer recalled that instead of him, it was the Duchess of Cambridge who was nervous about their meeting.
The Duchess of Sussex "trusts in her own decisions and makes her own way when it comes to motherhood."
The Duchess of Sussex said her sister-in-law hurt her feelings and made her cry days before her wedding to Prince Harry.
The Duchess of Cambridge was also previously caught on video rolling her eyes at the mention of the Sussexes during a school visit.
When Kate and William welcomed their first child Prince George in 2013, he gave his wife a diamond eternity ring by Anoushka.
Kate will follow in the footsteps of Queen Elizabeth II to set an example to others amid the COVID crisis.
The Duke of York is accused of "rape in the first degree" in a New York court by Virginia Roberts Giuffre.
The Duchess of Cambridge turns 40 years old on Sunday, Jan. 9.
The Duchess of Sussex "was already viewed by the public as incredibly glamorous thanks to her run on hit TV show, 'Suits.'"
Hosting world leaders is a major part of the royal responsibilities of the Duchess of Cambridge.
The Duchess of Cambridge will "come into her own even more" and become a strong source of support for the royals.