The 14-time CMA award-winning artist posted a picture with the 41st president on Twitter, thanking him for his service to the country, and complimenting his Irish shamrock socks.
"Thank you for lunch today @GeorgeHWBush, for your friendship, and service to our country's govt., military, also it's intelligence community. And you got #sockgame goin on," Paisley tweeted.
Paisley has performed for several presidents and has shared a friendship with the 93-year-old for many years.