See all the celebs who have made surprise appearances on Taylor Swift's '1989 World Tour.'
Alex & Sierra and Andy Grammer decided to perform a mashup of each other's songs and the results are killer.
Watch the exclusive premiere of Andy Grammer's 'Back Home' acoustic video!
YouTube celeb/lip syncing maestro Keenan Cahill has teamed up with singer Andy Grammer again! This time, Cahill moved his lips frantically in Grammer's semi-homemade video for 'Fine by Me.' Andy and Keenan make quite the pair, singing the upbeat ditty in Chicago, which is Keenan's hometown. The twosome sing before a huge crowd and Cahill must've felt like a million bucks.
According to Taylor Swift, singer Andy Grammer was merely passing through town, so she invited him to perform onstage with her in Nashville this weekend! What a way for Grammer to pass the time, huh? By performing onstage with one of the biggest music superstars out there? Some guys have all the luck, don't they?