(TMZ) - Senator John McCain literally melts when he talks about his favorite female celeb ... Britney Spears.
TMZ's photog got the 79-year-old Republican from Arizona at LAX Thursday, and he makes it clear ... he's not just paying lip service -- he's hardcore on Brit. He also has a favorite male celeb, who's a bit more predictable.
One place he can catch Spears and other chart-toppers is at our iHeartRadio Music Festival, which goes down September 23rd an 24th at the T-Mobile Arena in Las Vegas. Click here for more information!