Rob Reiner's Princess Bride star Cary Elwes pays tribute to filmmaker on what would have been his 79th birthday

Princess Bride star Cary Elwes has paid another heartbreaking tribute to Rob Reiner on what would have been his former colleague's 79th birthday. 

Elwes, 63, starred in Reiner's 1987 fantasy epic The Princess Bride and was among the many stars publicly grieving the late filmmaker following his tragic death. 

Reiner and his wife Michele were found stabbed to death at their residence on December 14. Their son, Nick Reiner, has been charged with the murders and is now awaiting trial. He has pled not guilty. 

On Friday, Elwes detailed his grief as he remembered the Hollywood legend on his birthday. 

Taking to Instagram, Elwes posted a photo of them at the 25th anniversary of their classic film accompanied by a moving message. 

'Today would have been your 79th birthday. Still hard to believe you’re gone. Missing you so much,' Elwes captioned the post.

Reiner flashed a  bright smile as he posed alongside Elwes, a warm hand on his shoulder. 

The Princess Bride starred Elwes as the dashing farmhand Westley in the rollicking tale of his quest to win the hand of Princess Buttercup, played by Robin Wright.

In order to do so, he and his motley crew of fantastical friends must first rescue her from Prince Humperdinck, played by Susan Sarandon's ex-husband Chris Sarandon.

Elwes was among the many stars and fans paying tribute to Reiner after his death last year. 

His tribute was accompanied by on-set footage of Reiner guiding him through a fight scene with André the Giant that will be instantly recognizable to fans of the film. 

'Enough time has passed that I can finally put my grief into words,' Elwes wrote in his Instagram tribute at the time. 

'I was 24 when I first met Rob Reiner on The Princess Bride. And from that very first meeting I fell in love with him. I was already a fan of his work so meeting him in person was a dream come true. As we began spending more time together I knew this was someone I wanted in my life,' he recalled.

He hailed Reiner as someone who 'wore his heart on his sleeve,' 'felt deeply' and harbored 'love and compassion' in his heart.

'This was a man who felt deeply. Whose heart was filled with love and compassion. He wasn’t impressed by how much money you had or if you had a privileged upbringing. He just wanted to know if you were a “good guy.” He always tried to find the best in people. And if that person had problems he felt bad for them,' wrote Elwes.

'He loved his family and friends immensely. He obviously loved making movies - and was clearly a brilliant filmmaker - but he told me what he really enjoyed the most was the experience itself,' Elwes remembered.

'He used to say, “Once the movie is released it belongs to other people. But while you are making it, that’s your time on the planet, so you wanna make it good.” And boy was my time with him on The Princess Bride beyond great. I can’t remember a single day without laughter,' the Robin Hood: Men in Tights star added.

Elwes also made reference to Reiner's love story with his 'incredibly loving, intelligent' wife who was 'passionate about her family and about lifting others up.'

The Reiners were a 'great team' whose 'only interest in fame was that it allowed them to shine a light on causes they believed in, especially helping those who were marginalized,' according to Elwes.

'In a town where many talk the talk, they truly walked it. Whenever we got together we would talk about family, life, movies and politics. But without fail Rob would always find a way to make us laugh. That was important to him. Finding the joy.'

Elwes sweetly added: 'And if I could make him laugh in return, I felt like I had won the lottery. His laugh was one of the greatest sounds I’ve ever known — so heartfelt it still rings in my ears.'

He thanked the Reiners for 'sharing your life and art with us. Because my heart still aches every time I think of you, I know the grief of losing you too soon will likely never go away. Sure, death cannot stop true love but life is pain without you.'

Elwes concluded: 'With this note my family and I send our deepest condolences and heartfelt prayers to their family, friends and fans.'

Rob's son Nick Reiner, 32, appeared in court last week, where his lawyer entered a plea of not guilty to the murder of his parents two months after they were found stabbed to death in their $13.5 million Brentwood home on December 14.

Last month, it was revealed that Nick's siblings are no longer paying for his criminal defense as he faces murder charges for allegedly killing his parents, which he pleaded not guilty to.

Hours after the killings, he was arrested and has been held without bail.

But as the case moves forward, with prosecutors confirming it is eligible for the death penalty, his legal representation now rests with a court-appointed public defender.