Kate Middleton and Prince William marked a fresh start by moving to Forest Lodge, as Adelaide Cottage became "a place of pain," royal biographer Sally Bedell Smith tells PEOPLE.

In moving to their new home, the eight-bedroom, $21 million Georgian mansion Forest Lodge, Prince William, Kate Middleton, and their three kids are leaving behind a difficult season that occurred during their three years living at their prior home, the four-bedroom Adelaide Cottage.

"The children are so gorgeous," she told the outlet of the Wales kids, who have worn Marie-Chantal pieces on several occasions. Princess Charlotte, pictured with Prince George, is seen wearing a Marie-Chantal dress in 2019.

Catherine, Princess of Wales, has privately pledged unwavering support for Prince William as he prepares for what allies tell RadarOnline. com will be his far-reaching overhaul of the British monarchy,

Prince William and Princess Kate have emerged as “the heart” of the Royal Family as the couple prepare for the end of 2025, according to a royal biographer. The princess has reemerged this year after recovering from her cancer treatment and revealing in January she is in remission.

Kate Middleton is reportedly "stepping up" with royal duties, including making major decisions about the futures of certain royals, in a bid to "streamline" the Royal Family.