Born in Uppsala, Sweden, since childhood, Lundstedt had wanted to be a singer. At the age of five he took part in a talent competition for children and achieved second place.

By the age of fifteen he appeared regularly on television and in shows as a member of the band Stage Four. The group consisted of four of the now most famous singers in Sweden; Lundstedt himself, Peter Jöback, Lisa Nilsson and Lizette Pålsson. In 1998 Lundstedt was the founding member of Alcazar.