Close family members today visited Kensington Palace to see Prince William and wife Kate Middleton's new baby daughter, who is fourth in line to the British throne.
Charles, the Prince of Wales and Camilla, Duchess of Cornwall are at the Kensington Palace, home of the Duke and Duchess of Cambridge.
Kate's parents, Michael and Carole Middleton, and her sister Pippa have also come to meet their newest relative.
The name of the duke and duchess's second child - sister to Prince George - will be announced later.
The princess, who was delivered yesterday at St Mary's Hospital in London, and weighed 3.7kg.
Tower Bridge was among several London landmarks lit up in pink in her honour.
Trafalgar Square's fountains and the London Eye were also illuminated on Saturday night to mark the birth.
The Cambridges will spend the next few days at Kensington Palace following which they are expected to travel to their country home Anmer Hall on the Queen's Sandringham estate in Norfolk, the BBC reported.
Bookmakers say Charlotte and Alice have emerged as the favourite names for the princess, followed by Olivia, Victoria and Elizabeth.
Meanwhile, almost all of the UK's national newspapers have given over the entire front pages of their Sunday editions to the birth and a photograph of the new princess though the country was in the midst of general elections.
With their new daughter wrapped in a white shawl, the duke and duchess emerged from the hospital to crowds of well- wishers and the world's media, a little less than 10 hours after the birth.
They stood on the steps of the Lindo Wing briefly before heading back inside to put the sleeping princess in a car seat. Prince William, who had been present for the birth, then drove them to Kensington Palace.
When Prince William left the hospital to fetch his son for a visit to his new sister, he told those outside he was "very happy".
In a statement, Kensington Palace said: "Their Royal Highnesses would like to thank all staff at the hospital for the care and treatment they have all received.
"They would also like to thank everyone for their warm wishes."
Willam's father, Prince Charles, who had said he wanted his second grandchild to be a girl, and Camella were left "absolutely delighted" by the news, Clarence House has said.
Messages of congratulations also came from the Archbishop of Canterbury Justin Welby and political leaders including Prime Minister David Cameron, who called it "wonderful news".
