Blake Shelton joked with the audience that his girlfriend, singer Miranda Lambert, came with him to the 40th Anniversary Jam: A Musical Tribute to Radio event last Friday because she knew there would be a lot of pretty girls in the audience!

Lambert may have come out to watch over her boyfriend, but she also joined him onstage to sing the pair's rendition of 'If I Said You Have A Beautiful Body (Would You Hold It Against Me?)' -- a hit by the Bellamy Brothers. Shelton and Lambert hammed it up throughout their performance, giving each other adoring looks and hugs during the appropriate lines from the song. When the band took an instrumental break, the couple even danced a few steps around the stage.

The theme for the show, the final concert of the week for attendees at the annual Country Radio Seminar in Nashville, called for artists to sing songs that had been favorites of theirs from the last four decades. Shelton co-hosted the Jam with Andy Griggs at Nashville's Cadillac Ranch.

Other performers included Chuck Wicks, who sang Eddie Rabbitt's 'Drivin' My LIfe Away.' His explanation for singing that particular song: "I was one year old when it came out in 1980, and I went around singing that song all the time." His girlfriend, Julianne Hough, was also there. The two didn't sing together, but she offered her version of the Eagles' hit, 'Heartache Tonight.'

Chris Young sang 'Rainy Night in Georgia,' a Brooke Benton tune that he covers on his upcoming album, and Jimmy Wayne performed 'Sarah's Smile,' a Hall & Oates cover. Griggs did a Waylon Jennings tune, 'I Don't Think Hank Done It This Way,' while Emerson Drive chose the Nitty Gritty Dirt Band song, 'Fishin' in the Dark.' James Otto sang The Commodores' 'Easy' and Crystal Shawanda performed Pam Tillis' 'Maybe It Was Memphis.' Others on the show included Jamie O'Neal, Emily West, KingBilly, Amanda Wilkinson, Mandy Barnettt and Jessica Harp.