The sweetheart-neckline dress featured a chiffon bodice covered in heavy floral embellishment, and she finished off the look with a pair of long gloves and a tiara.
Princess Rajwa's hair was styled in a loose chignon, showing off a pair of delicate diamond-drop earrings that she had worn earlier in the day.
Her new mother-in-law, Queen Rania, also changed outfits for the event, opting for an intricately detailed blush Elie Saab dress. The Lebanese couturier was also the designer of choice for the outfits donned by Princess Rajwa and Kate, Princess of Wales for the main wedding ceremony.
For the evening reception, the Princess of Wales wore a lavishly sequinned pink gown by Jenny Packham, along with the Lover's Knot tiara, a pink clutch and earrings.
US first lady Jill Biden wore a lilac dress, featuring heavy floral embroidery, accompanied by a light pink shawl.
Earlier on Thursday, Prince Hussein married Princess Rajwa in a traditional Muslim ceremony at Amman’s Zahran Palace, in front of family, royals and foreign dignitaries.
Queen Rania oozed style and glamour in an embroidered black Dior gown for the nuptials.
The queen took to Instagram to share her congratulations to the happy couple.
“May God bless you both and fill your home with love and happiness. From Hussein and Rajwa’s wedding ceremony,” Queen Rania posted, along with pictures from the day.
The newly married couple then took part in motorcade parade to Al Husseiniya Palace for the celebration banquet that ran late into the evening.
The ceremony concluded with the couple cutting a seven-tier wedding cake.