"There was a little bit of controversy about this film ..." the host began.
"There's a lot of gay sex in it," McGregor interjected. "There's a LOT of gay sex in this cartoon. I think if you live anywhere near Alabama, you should not go and see this film. What would Jesus think?"
As Colbert tried to downplay LeFou's sexuality suggesting it was a subtle suggestion rather than an overt character trait, McGregor stood firm.
"I think he is a gay character," he announced.
"He is? I thought it turned out that it doesn't actually say?" asked Colbert, to which McGregor scoffed.
"It's just like: He IS a gay character. It's 2017, for f**k's sake!"
Beauty and the Beast is released in New Zealand cinemas on March 30.