Singapore's fast-growing Christian community has been shaken by the trial of six evangelical church leaders accused of embezzling more than $S50 million ($40.5 million) to fund the career of US-based pop star Sun Ho.

Ms Ho accompanied her accused husband Kong Hee to the Subordinate Courts, but left before prosecutors alleged funds of the City Harvest Church were diverted into "sham" investments.

Ms Ho, whose beautiful voice and daring dance moves propelled her to the top of US charts, is not on trial and early this week was reinstated by Singapore's Commissioner of Charities as City Harvest's executive director after a review found she had not contributed to mismanagement of the church which has affiliates in 48 countries, including Australia.

Pastor Kong, who married Ms Ho 20 years ago, is charged with conspiracy to commit criminal breach of trust in a trial that began before a packed court on Wednesday.