Jim Carrey twice carried the coffin at his ex-girlfriend's funeral as she was taken to her final resting place beside her late father.
Cathriona White, remembered as a loving daddy's girl who wanted the world to be a better place, was found in her Los Angeles home late last month after a suspected suicide.
Carrey dated the 30-year-old make-up artist for a while in 2012 and they were pictured hand in hand in New York earlier this year.
The Hollywood star fought back tears and walked with his arms around Ms White's sister Lisa as hundreds of family and friends gathered to mourn her death at the Church of Our Lady of Fatima in the village of Cappawhite, Co Tipperary in Ireland.
Ms White's stepsister Sarah gave a moving eulogy in which she said love was the only word she needed to remember her.
She said it was a constant in her life.
Sarah also recalled her passion for photography and her passion for documenting the lives of the homeless in LA.
"Anyone who saw her lurking around LA with a camera trying to capture the poor conditions in which the homeless were forced to live will know not just her love and talent for photography but also her desire for the world to be a better place, because she was in it, and it was," she said.
Ms White was remembered as family centred and a vocal fan of hurling.
"Cathriona had such an amazing capacity to love and to be loved," Sarah said.
She said losing both her stepfather and stepsister within a few years was unimaginably difficult.
But she added: "We can take some comfort in the knowledge that Cathriona and Pat are together again. She is at peace.
"We need to find comfort for each other. There is no easy fix for grief. Particularly when we have lost somebody so young with so much left to give.
Signing off Twitter, I hope I have been a light to my nearest and dearest.
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