Princess Mako of Japan and Kei Komoru got engaged in 2017 and are set to marry this year.
As the niece of Emperor Naruhito, Mako must let go of her royal status in order to wed a "commoner.".
She's rejected the $1.3 million handout by the Japanese government to start her new non-royal life.
Komuro, according to the publication, already lives in the US and is awaiting the results of his law exams in December.
Princess Mako is niece to Emperor Naruhito, the older brother of her father Prince Akishino.
"We are irreplaceable for one another, and we lean on each other in happy times and unhappy ones," she added.
Representatives for the Imperial Household Agency of Japan did not immediately respond to Insider's request for comment. »