The Mean Girls actress was given the tragic news about her mother's brother late on Sunday evening (09May10), and immediately headed for the family home in New York to comfort her mum, Dina.
And the heartbroken actress admits she felt "sick" when she heard about her uncle's passing.
In a series of posts on Twitter.com, she writes: "My mom's brother, my uncle who's amazing, just passed - may he rest in peace.... Rushing to see Dina Lohan - I love you mommy xx... Did Billy Joel curse us when he said, 'Only the GOOD die young'? I don't know how to feel as I'm rushing home to my mom's house after just wrapping work nearly 3 hours ago or less... I feel sick."