The royal will attend the wedding of his ex-girlfriend Jecca Craig on March 25 in Africa while Kate remains home in Norfolk with their two kids, Prince George and Princess Charlotte, during the holiday.
Will is currently in Africa performing his royal duties and, as luck would have it, he's in Kenya the same day as the nuptials.
Part of Prince William's visit includes a face-to-face meeting with Kenyan President Uhuru Kenyatta to discuss foreign relations.
According to the Palace's release, the goal of the meeting is "to deepen relations between the two countries on a broad range of topics including defense and security, and conservation." The statement then said, "The remainder of this short visit to the country will be private."
The wedding between Will's ex and professor Jonathan Baillie is in Isiolo, Kenya.
Us Weekly reports that the wedding will be held at Jonathan's 55,000-acre family estate, which is also the oldest wildlife sanctuary and private safari in the country.
Will and his ex have been friends for decades. The two were first linked together when they were teens during William's gap year after graduating from Eton.
Despite their split, they remained good friends, and she even attended Will and Kate's royal wedding in 2011 with her then-boyfriend, Captain Philip Kaye.
Jecca is also friends with Will's brother Prince Harry and she accompanied both of them during a weekend hunting trip in Spain in February 2014. There, the group was photographed joking and laughing together at the Seville airport.
While Will is at the nuptials, Kate will celebrate Princess Charlotte's first Easter.
Meanwhile, Harry is in Nepal, where he recently extended his trip.
"The people I have met and the beauty of this country make it very hard to leave. Thankfully however, I'm not leaving just yet," he told "Today," explaining his plans to spend the next six days working on the earthquake relief project. "I'm so grateful to have this opportunity at the end of my official tour to do my small bit to help."