Grandpaboy is an alternative rock group led by Paul Westerberg (born December 31, 1959). Paul Westerberg is an American musician, best known as the former lead singer and songwriter of The Replacements, one of the seminal alternative rock bands of the 1980s. Westerberg is married to former Zuzu's Petals guitarist Laurie Lindeen. They have a son, Johnny, whose voice can be heard on "Whatever Makes You Happy" from Westerberg's solo album Suicaine Gratifaction.