SINEAD O'CONNOR broke up with her boyfriend on Christmas Eve, a year after splitting from her husband Barry Herridge.
The Bray lady had been dating mystery man 'David' for a number of months before the split.
Sinead appeared on Grafton Street with fellow stars Bono and Glen Hansard for a busking session on Christmas Eve.
Her former boyfriend is 40 and an anthropologist. The relationship began with a friendship after he contacted her for help with a research paper. 'David wrote to me and I helped him out with his thesis,' she said. 'We were mates for about eight months.'