Hollywood is mourning the loss of a legend... As we reported, news broke on Friday that Catherine O'Hara has passed away at 71. Two sources with direct knowledge confirmed the devastating news to TMZ. Her cause of death is unclear at this time, though we now know a medical emergency involving trouble with breathing occurred at her Los Angeles home early Friday morning. Related: Lizzo Is DEVASTATED In Emotional Video Remembering Beloved Activist Ms. Shirley Catherine is one of the most beloved actresses, starring in roles like Delia Deetz in Tim Burton's Beetlejuice, Moira Rose in Schitt's Creek, and Kate McCallister in the Home Alone movies. We truly lost an icon. And now, celebrities are taking to social media to offer their condolences and pay tribute to the late comedian. Related: Macaulay Culkin Mourns Home Alone 'Mama' Catherine O'Hara Canadian comedian Tom Green was one of the first to remember Catherine on X (Twitter), saying: "I'm so sorry to hear the news that Canadian comedy legend Catherine O'Hara has passed away at 71. She's kept me and millions of others entertained throughout my lifetime - from her brilliant work on SCTV, to Home Alone, Beetlejuice, Best in Show, Schitt's Creek, and so many other films and television classics. Her characters brought so much joy and laughter to the world. It's with a heavy heart that I share this today. Rest in peace, Catherine O'Hara - one of the greatest Canadian comedy icons of all time." Hilaria Baldwin, the wife of Alec Baldwin, who starred in Beetlejuice with Catherine, took to Instagram Stories to mourn her sudden loss. See (below): (c) Hilaria Baldwin/Instagram Andy Cohen recalled first falling in love with Catherine on the sketch comedy show SCTV: "Fell in love at first sight on SCTV and it only got stronger. Rest In Peace, Angel Catherine O'Hara" View this post on Instagram A post shared by Andy Cohen (@bravoandy) Octavia Spencer said on Instagram: "Devastated to hear about the passing of the legendary Catherine O'Hara. A true icon who will be remembered forever. Sending love to her family, friends, colleagues, and fans everywhere " Nina Dobrev called it "a very sad sad day," adding: "Rest in peace to this absolute legend & icon" Catherine's former co-star Pedro Pascal posted a picture of them together on the set of The Last of Us to IG, writing: "Oh, genius to be near you. Eternally grateful. There is less light in my world, this lucky world that had you, will keep you, always. Always" View this post on Instagram A post shared by Pedro Pascal he/him (@pascalispunk) Rita Wilson remembered Catherine as "a woman who was authentic and truthful in all she did." She added: "You saw it in her work, if you knew her you saw it in her life, and you saw it in her family. Bo, Luke and Matthew, our deepest sympathies. May Catherine rest in peace. May her memory be eternal." View this post on Instagram A post shared by Rita Wilson (@ritawilson) Justin Theroux, her Beatlejuice Beetlejuice co-star, expressed: "Oh Catherine. You will be so so missed." View this post on Instagram A post shared by @justintheroux Constance Wu posted a throwback photo of Catherine in Best in Show, along with the caption: "Truy one of the finest actors of her generation. Here she is in Best in Show-one of my favs. Rest in Peace Catherine O'Hara" Amy Schumer commented on a post about her death: "Ugggg legend. No one funnier." Olivia Munn also chimed in to say Catherine was "the kindest person" in Hollywood: "Absolutely heartbreaking. She was the kindest person in our business." Fellow SNL alum Mike Myers paid tribute in a statement to The Hollywood Reporter: "It is a very sad day for comedy and for Canada. She was one of the greatest comedy artists in history, an inspiration for millions and above all a very elegant lady. Sending much love and condolences to her family." Posting a pic of Catherine's iconic character Moira to IG, actress and comedian Sandra Bernhard mourned: "A classic moment with the tremendous #catherineohara what a terrible loss she was a class act nuanced humble a total natural she brought buckets of joy to this old planet she will be deeply missed she was an inspiration to anyone who fancies themselves humorous a masterclass every time she stepped in front of a camera" Then, like so many of us, Josh Gad shared that he is so shocked by the sad news - and isn't ready to say goodbye. He wrote: "I don't understand what I'm seeing. I can't bring myself to believe she is gone. Why is the world such a heart breaking place right now? I truly cannot process how to say goodbye to someone so full of life who seemed to just be hitting her prime. Goodbye legend. Thank you for making us laugh until we hurt... which is why right now we are all hurting so damned much knowing we will never again get those laughs. RIP. My love and deepest condolences go out to her entire family." Wow. It's really hard to believe she is gone. See more tributes to Catherine (below): From SCTV to Home Alone to