The royal baby born today may not have a name yet, but astrologers are already predicting the little prince's personality traits.
Only a small window of time separated whether Will and Kate Middleton's son would be a sensitive Cancer or a dynamic Leo, as the cutoff for becoming a Cancer occurred the same day the future heir to the throne was born.
While the two signs are next to each other on the calendar, they could not be more different, as Cancer is a water sign ruled by the moon while Leo is a fire sign ruled by the sun.
Before the baby's arrival, astrologer Patrick Arundell predicted the little one would have a "very Cancerian personality" even if born under the sign Leo.
"Either way, he or she is going to be larger than life, charismatic and glamorous...and be sensitive and caring," he told the U.K.'s Telegraph. "If the baby's born today it will have a slightly more conventional and conservative personality, but if it's born tomorrow it will be more groundbreaking and more in tune with modernity," he added.
Due to the position of the planets, Arundell also predicted the newborn will have a great deal of energy, determination and star power.
"Mars and Jupiter are conjunct in Cancer and that will give the baby a tremendous amount of go-get energy and that is already in motion," he said. "Venus and the Sun are also in a magnetic connection which will give the baby a star quality and a sparkling charisma."
In addition to the new dad, Prince William's mother, Diana, was also a Cancer. Other famous stars bearing the Cancer sign include Harrison Ford, Tom Hanks, Tom Cruise, Khloé Kardashian Odom and Nelson Mandela.
Historically speaking, the birth date of the future heir was incredibly crucial and was believed to determine whether the next in line was fit to rule.
"Before the era of DNA and genome sequencing, casting a Royal Heraldry chart was the way people checked the genetic heritage of the monarch's bloodline," Dr. Elizabeth Hurran, a historian at the University of Leicester, told the U.K. Telegraph. "Historically speaking, the Royal family have a much better track-record with Leos than Cancerians," she added.
Middleton gave birth to the couple's first child in the Lindo Wing at St. Mary's London hospital July 22.
"Her Royal Highness and her child are both doing well and will remain in hospital overnight," Kensington Palace said in a statement.
"We could not be happier," Prince William added.
Tune in to E! News for continuing coverage of the royal baby!