Jordan’s crown prince married the scion of a prominent Saudi family on Thursday in a palace ceremony attended by royals and other VIPs from around the world, as massive crowds gathered across the kingdom to celebrate the region’s newest power couple.

The marriage of Crown Prince Hussein, 28, and Saudi architect Rajwa Alseif, 29, drew a star-studded guest list including Britain’s Prince William and his wife Kate, as well as U.S. First Lady Jill Biden.

The celebrations hold deep significance for the region, emphasizing continuity in an Arab state prized for its longstanding stability and refreshing the monarchy’s image after a palace feud. It even could help resource-poor Jordan forge a strategic bond with its oil-rich neighbor, Saudi Arabia.

The bride, wearing an elegant white dress by Lebanese designer Elie Saab, arrived at Zahran Palace in a 1968 Rolls-Royce Phantom V custom-made for the crown prince’s late great grandmother. The crown prince arrived earlier in full ceremonial military uniform with a gold-hilted saber.

The families and their guests gathered in an open-air gazebo decked with flowers and surrounded by landscaped gardens for a traditional Muslim wedding ceremony known as “katb al-ketab.” The crowd erupted in applause after the signing of the marriage contract. Alseif will henceforth be known as Her Royal Highness Princess Rajwa Al Hussein, according to a royal decree.