Alan Thicke and his death sent a shockwave through social media, as an immediate reaction of celebrities expressing their shock and condolences at the beloved actors passing occurred.
Thicke died of a heartattack after playing hockey with his 19-year-old son, Carter. The actor was 69 years old.
Thicke's most memorable role was as Dr. Jason Seaver of Growing Pains, in which he starred from 1985-1992.
See the heartfelt celebrity reactions to the death of Alan Thicke.
"Today I lost my best friend and my idol," Thicke's youngest son, who was with him when he died, wrote on Twitter. " The world lost one of its finest. You are a legend and I love you Pops. Until next time."
On Facebook, Gloria Loring -- Thicke's first wife and mother of Robin Thicke -- wrote, "Dear Friends, Thank you for your kindness concerning Alan Thicke’s passing. It is a shock. We were all just together for Thanksgiving. He was talented, funny and deeply devoted to his family. Rest In Peace, dear one."
Paula Patton, Robin Thicke's ex-wife, posted a quote from Mother Teresa on Twitter. It read, "Life is an opportunity, benefit from it. Life is beauty, admire it. Life is a dream, realize it. Life is a challenge, meet it. Life is a duty, complete it. Life is a game, play it. Life is a promise, fulfill it. Life is sorrow, overcome it. Life is a song, sing it. Life is a struggle, accept it. Life is a tragedy, confront it. Life is an adventure, dare it. Life is luck, make it. Life is too precious, do not destroy it. Life is life, fight for it."
"So sad is the passing of Alan Thicke. Such a good husband, father, brother, and friend. He will be deeply missed. Rest in peace dear Alan."
Candace Cameron Bure
Candace shared the above photo on Instagram with the caption, "I'm sad beyond words that Alan Thicke has passed away. I've known you since I was 8 years old and so glad I had the pleasure of working with you again so recently on Fuller House. You were a part of my family and hockey family. You will be greatly missed. My heart hurts."
Fuller House actress and '80s and '90s TGIF staple, Lori Loughlin, expressed her sentiments on Twitter. She wrote, "I'm so sad to hear about the passing of Alan Thicke. RIP Alan."
Former co-star and on-set "son" in Growing Pains, Kirk Cameron expressed his heartbreak on Facebook. "I spent Monday through Friday for seven important years with Alan Thicke as my 'TV dad.' I'm shocked and truly heartbroken today at the news of his death. Alan was a generous, kind and loving man. I am so blessed to have grown up with him. Chelsea and I send our love and prayers to his family tonight. We will cherish the memories ... 'sharing the laughter and love.' " he concluded, citing lyrics from the popular show's opener.
Thicke even had an impact on the millennials and their favorite celebs. On Twitter, Demi Lovato wrote, "Had the pleasure of meeting Alan Thicke and his amazing wife Tanya a few years back.. my thoughts and prayers are with his family. RIP."
Dave Coulier, Fuller House actor and friend of Thicke, wrote on Twitter: "RIP Alan Thicke. We skated side by side for years. Say hello to Gordie and The Rocket for me. Our Canadian Mounties sketch."
Ellen DeGeneres tweeted, "I am so sorry to hear about Alan Thicke's passing. My love and prayers to his family."
Friend Alyssa Milano of Who's the Boss fame, wrote on Twitter: "Alan Thicke was always the nicest and happiest person in the room. Gone way too soon. Rest in peace."
Robin Thicke, Alan's eldest son, posted a meaningful tribute on Instagram. The Blurred Lines singer wrote, "My father passed away today. He was the best man I ever knew. The best friend I ever had. Let's all rejoice and celebrate the joy he brought to every room he was in. We love you, Alan Thicke. Thank you for your love. Love," he signed, "Your grateful son."
On Twitter, Ryan Seacrest, wrote, "Sad to learn of Alan Thicke's passing. He was a great friend over the years. Thoughts & prayers to his family."
Andrea Barber, AKA "Kimmy Gibbler," TGIF staple and Fuller House cast member shared a moving tribute on Twitter. She wrote, "There are no words for how sad this is. What an honor to have been able to work with him. Rest In Peace, Alan."
Kris Jenner, lesser-known chum of Thicke, posted on her Instagram: "My heart is heavy. So deeply saddened by the loss of a loving father, talented actor and incredible friend. Alan you were loved by so many and you will be missed by us all. My thoughts and prayers are with the Thicke family."
Gilbert Gottfriend, old friend of Alan Thicke's, wrote on Twitter, "To my @WifeSwap partner ... I'll miss you. RIP Alan Thicke."
Leah Remini shared a throwback photo on Instagram and captioned it, "Just heard of Alan Thicke's passing. I had the pleasure of working with him this year. He was such a talent and good guy. My heart goes out to his family and friends. May he rest in peace."
Radio and television host Billy Bush was close, personal friends with Thicke. He shared the above photo on Instagram and wrote, "He was the funniest and most thoughtful guy in town. In these last few months, he reached out. A lot. Always checking in. God just got a great joke writer ... if Pryor doesn't take him back first."
Comedian Dane Cook took to Twitter and wrote the sentiment in everyone's hearts: "RIP Alan Thicke who was a great talent and a genuine person. #everyonesdad."
John Legend, friend of Alan's son, Robin Thicke, wrote, "RIP Alan Thicke. I grew up watching him and got to know him through Robin. He was always so kind to me. So sad to hear about his passing."
Montel Williams wrote, on Twitter, "Now Alan Thicke ... Can we get a do-over on 2016? Too many good people lost and way too many bad people getting lucky ... RIP Dr. Seaver."
William Shatner tweeted, "Saddened over the loss of my friend Alan. Condolences to his family."