Una Healey made her first public appearance since ex Ben Foden's whirlwind wedding tonight as she performed a personal song at a festival in Northern Ireland.
The 37-year-old Saturdays singer, who has two children with Ben, was said to be in shock after discovering that her rugby player ex-husband, 34, had remarried.
Ben recently announced that he had married New Yorker Jackie Belanoff Smith, who he had only been dating for two weeks.
And tonight at Farmer's Bash festival in Portrush, Una returned to the spotlight to sing a "very personal" track she had written to herself, entitled 'Strangers'.
Sharing a clip of her singing the song on her Instagram Stories, she was heard belting: "Tell me, did I really ever get to know you? Did you really care for me like you're supposed to? Oh, did you?
"Empty, every word you said to me was empty. Broken every promise that you made me. No, we can't save this."
She later sang: "I guess everything I gave was not enough. I gave you my whole heart but, tell me, was it love for you? I will not regret, I gave my all. Strangers when we met, now strangers at the end."
Later on stage she also sang Miley Cyrus' Nothing Breaks Like A Heart.
Una and Ben announced their divorce last year after he admitted to cheating on her while on a night out with his rugby friends.
Sharing pictures of his new bride on Instagram , Ben said he'd finally found happiness after a tough and turbulent year during which he divorced Una.
34-year-old Ben said that Una, the mother of his two children, had even given her blessing for the marriage to Jackie.
Una broke her silence on his wedding in an interview earlier this week, in which she vowed to put the past behind her.
She said: "Oh gosh, life in general just changes all the time, doesn't it? Not just because I'm not in the group anymore, but because my whole life has changed a lot in the last year even.
"So much can happen in five years, and so little can happen. That's why I hate when anyone asks the question, 'Where do you see yourself in five years?' because you never have any idea. A day can change your life.
"You just have to expect that. You can only take one day at a time and you can't relive your past. You have to just keep positive as much as you can, take it as it comes and enjoy it."
