Credit: Barry King/

Forget Prince William and Kate Middleton -- there's another royal wedding to look forward to.

A rep for Earl Spencer, 46, brother of Princess Diana, confirms to that he'll marry girlfriend Karen Gordon this summer. The wedding will be a private ceremony on June 18 at Spencer's Northamptonshire home -- just two months after William and Kate's April 29 nuptials. A guest list for the Spencer nuptials has not yet been released.

Gordon is a Canadian philanthropist and the founder and CEO of Whole Child International, a nonprofit that works with disadvantaged kids.

This is Spencer's third marriage. He has four children from his first marriage to Victoria Lockwood, and two from his second marriage to Caroline Freud.

It's a busy wedding season for the royals: Prince William's cousin Zara Phillips will also marry longtime boyfriend Mike Tindall.