According to ABC News, the couple has written their own vows, even though they just began the process only days ago.
Catherine will be wearing a Monique Lhuillier gown and Sean will be wearing a “baller tux” by Dolce and Gabanna that he described as “amazing” with “a bit of sheen to it,” ABC News reports.
Both will be wearing Neil Lane jewelry for the event.
Wedding guests will include successful “Bachelor” couples, including Jason and Molly Mesnick, Ashley Herbert and J.P. Rosenbaum, Trista and Ryan Sutter, and engaged couple “Bachelorette” Desiree Hartsock and Chris Siegfried, according to ABC.
The wedding of Sean and Catherine airs live Sunday night at 8/7c on ABC.