On Wednesday, Charlene, 36, and Albert, 56, welcomed Prince Jacques, Honoré, Rainier and Princess Gabriella, Thérèse, Marie.
“It is with immense joy that TT.SS.HH the Prince and Princess of Monaco have the great pleasure to announce the birth of their children,” according to a press release from the Monaco palace.
The twins were born in the Princess Grace Hospital Monaco, named after their late grandmother.
According to the palace, the royal couple’s newborn son is the crown prince and first in line for succession. Also, “in accordance with the historic custom established by the treaty of Péronne (1641), he shall receive the title of Marquis of Baux (in Provence).”
The newborn princess will receive the title of Countess of Carladès (in Auvergne) and is the second child in the line of succession.
The sex of the twins was a surprise for the prince, who told friends he didn’t want to know ahead of time.
The twins are the first children for Albert and Charlene, a South African-born swimmer. The couple got married on July 1, 2011. (Albert, the son of Princess Grace and Prince Rainier, has two other children from previous relationships: Jazmin Grace Grimaldi, 22, and Alexandre Coste, 11.)