In November, Spears revealed that Donatella Versace would be designing her wedding dress.
Asghari proposed to Spears at her house in September after dating for about five years.
Spears and Asghari were first romantically linked after they met on the set of the singer's Slumber Party music video in 2016.
They took nearly "five months" to reconnect after her video shoot, Spears said in a radio interview in 2017.
"I was like, 'He was really cute, this guy was really cute,' so I called him," Spears recalled about digging up his phone number. "He's just a really fun, funny person."
"It was the humbleness that attracted me," he said in a GQ interview in June.
"She was very humble and she had a beautiful soul."
Despite riding high on luxe vacations recently, the pair experienced a loss when Spears announced she had suffered a miscarriage.
"It is with our deepest sadness we have to announce that we have lost our miracle baby early in the pregnancy," the statement read. "This is a devastating time for any parent."