One of the Backstreet Boys says that Casting Crowns' Mark Hall is "an inspiration in every way." 

Hall recently posted a screenshot to Instagram of a text conversation between himself and Brian Littrell of the Backstreet Boys.

The message shows Hall reaching out to Littrell to prove to three young people that Littrell is "the most famous person" Hall knows. Littrell messaged back to Hall with a selfie giving thumbs up.

When Hall posted the conversation to Instagram, Littrell responded again. "Love what you do and how your serve," he said about Hall. "You are an inspiration in every way, both on and off the stage."

Littrell has been very open about his Christian faith in the past. He's also released two Christian solo albums.