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. They made their European breakthrough with the hit single "Crying at the Discoteque". After this success Alcazar had several more hit singles. One of them was "This is The World We Live In" (2004). Alcazar reunited in 2007 after a two-year break and today consists of Tess Merkel, Lina Hedlund and Lundstedt. Lundstedt released one album and four singles in the years 1996-1997, and in 2006 he released a new single, "Lovegun"/"Nightfever", which includes a new song as well as a cover of the Bee Gees hit song "Night Fever". His most recent single is "Move", which also is going to be included on his forthcoming album. In addition to his pop music career, he has had roles in the musicals Grease and Chicago. In autumn 2005 and spring 2006 Lundstedt starred as Tony Manero in the musical Saturday Night Fever in Stockholm, Sweden, for which he received favourable press reviews. He also works as a choreographer, and has choreographed many of Alcazar's dance moves. Lundstedt is openly gay and was involved in a relationship with a former member of Alcazar, Magnus Carlsson. In December 2007, Andreas confirmed the rumours that he is HIV positive.

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