After arriving at Windsor Castle, Williams laughed it up with George Clooney, while Ohanian hobnobbed with his wife Amal. That's English actor Idris Elba in the background.
Ohanian and Williams had one of the best views in the house. They were seated in the top row on the bride's side of the aisle, at the front of the chapel.
Markle calls Williams one of her close friends. The two met at a SuperBowl party in 2010, and became good friends long before either woman started dating their significant others.
Photographers captured Ohanian on his phone before the ceremony began.
On Sunday, Ohanian posted a video of himself getting ready for the wedding. "You may call me Lord Ohanian from now on," he said in the video.