Alesha Dixon has followed boyband Five in pulling out of a concert organised by Leave.EU after discovering it was a political rally.
Earlier on, the boyband pulled out for the same reasons.
Two of the three members of the band - Ritchie Neville and Scott Robinson - were due to perform at the BPop Live concert in Birmingham just days before the EU referendum.
The 90s group, known for hits like Keep On Movin' and Let's Dance, have now cancelled their performance, although other acts including East 17 are still listed to appear.
The band said in a statement: "When Rich and Scott agreed to play the event they understood that it was a pop concert funded by one of the Brexit organisations and not a political rally.
"As it has come to light that this is more of a political rally with entertainment included they have both decided to cancel their involvement.
"They would like to make it clear that as a band Five has no political allegiances or opinions for either side. Their allegiance is first and foremost to their fans."
The band's exit comes after drum 'n' bass act Sigma pulled out of the concert and told Buzzfeed they are "in no way supporting the event".