The Duchess of Sussex played paralegal Rachel Zane on the hit show for six years and invited its cast and creators to her royal nuptials to Prince Harry at St George's Chapel, Windsor, in May last year.
"The thing I'll say about it is that we all went as a family," Korsh said, according to E! Online. "When we all went, there were about 10 of us or something...it was unbelievable."
He added: "I think it changed our lives in certain ways, forever. But if it had never happened, we were a family on Suits for 10 years."
In the lead up to the royal wedding cast member Patrick Adams, who played Meghan's on-screen husband, posted a snap of the cast and crew out to dinner at The Barn at Coworth Park, Ascot, with the caption: "The last supper #royalwedding."
As well as Patrick Adams, co-stars Abigail Spencer, Sarah Rafferty, Gina Torres, Rick Hoffman and Gabriel Macht were also there to witness their friend Meghan tie the knot with Prince Harry.
The Duchess of Sussex portrayed Rachel Zane since 2011, quitting the show after its seventh season to focus on her royal duties. Her final episode aired a few weeks before the royal wedding.