Guest, 58, died early today in Melbourne's St Vincent Hospital after he was admitted on Tuesday night following a massive stroke.
He was surrounded by partner Kellie Dickerson, two teenage children, and other family and friends.
"Our sympathies are with his family and friends on this sad day," Miss Clark said.
"For many years Rob Guest has inspired many New Zealand and Australian audiences with his remarkably powerful performances.
"He touched many lives and will be sadly missed," Miss Clark said.
The English born entertainer rose to pop fame in New Zealand in the 1970s when he began performing on the television show Happen In.
He also performed for 10 years in Las Vegas before his stage musical career took him to Australia where he starred in Les Miserables and The Phantom of the Opera.
He was made an officer of the Order of the British Empire (OBE) for his services to the New Zealand entertainment industry in 1994.
Guest had been starring in the musical Wicked in Melbourne and gave his last performance on Sunday night.
