The Sun reports that Deuces, co-owned by The Only Way Is Essex star Mark Wright, was targeted in a turf war between local gangs.
A brick was allegedly thrown through the window and the venue set alight just hours after a pre-launch party was filmed for the ITV2 reality show.
Police are treating the blaze as "suspicious". A source said: "We think it is maybe a gang that has targeted other bars in the Essex area. We believe it could be part of a gangland territory war."
"I am extremely disappointed. Jack is gutted," Wright added.
The report claims that the pair are hoping to open the bar next week.