The couple, who met in late 2016, are believed to be planning a lavish wedding at Lang Walker's $100 million Kokomo Island resort according to Women's Day.
The resort is also were the TV host popped the question back in February.
"Jasmine wanted a big splashy wedding and Karl is determined to deliver her dream wedding," a source told the outlet.
"I know she's spoken to a handful of top designers around the world over the past six months before she settled on the perfect dress," the source added.
The couple got engaged in January this year and celebrated a commitment ceremony in March in front of family and friends.
Karl and Jasmine met shortly after the TODAY host split from his wife of 21 years Cassandra Thorburn in 2016
The pair, who officially divorced in October 2017, have three children together: Jackson, 18, Ava, 12, and River, 10.