It is expected to be one of the celebrity weddings of the year with many well-known faces and rumours that Stevie Wonder will be performing.
The golfer was previously engaged to tennis player Caroline Wozniacki but the couple broke up in May 2014.
It is thought he began his relationship with Erica Stoll later that year. The couple became engaged in December 2015.
Holywood golfer Rory McIlroy will marry his American fiancée Erica Stoll at Ashford Castle in County Mayo later.