He has now addressed this, insisting that his issue wasn't with the wedding itself, but one mystery guest's need for a Smint.
Yes, really.
Rick said on his Instagram page: "So, to answer any questions about the weird face that was made at the wedding.
"Imagine sitting next to people to your right and not knowing which person it was that has halitosis.
"Hence the face that's apparently now is all over the place. So... it's as simple as that, Charlie."
Also at the wedding were 'Suits' stars Gina Torres, Sarah Rafferty and Abigail Spencer, as well as Meghan's on-screen husband, Patrick J Adams, who posted a thoughtful message for her on the night before the wedding.
A number of Meghan's famous friends also showed up on the big day, including 'Quantico' star Priyanka Chopra, tennis pro Serena Williams and human rights lawyer Amal Clooney, who attended with actor husband George.
Rick's wasn't the only face viewers had an eye on during the wedding, though, with many pointing out that Victoria Beckham was looking her usual chipper self.