Kirk Douglas spent his latest birthday surrounded by the people he loves.
The legendary actor turned 101 years old on Saturday, and on Monday, actor Michael Douglas -- one of Kirk's three living sons -- shared photos from their family celebration on Facebook. Kirk enjoyed a sunflower-themed birthday cake, as his wife, Anne Buydens, sat beside him. Kirk's son, producer Joel Douglas, was also present for the festivities, as was his granddaughter from son Peter, Kelsey Douglas.
"My brother Joel and I attend a family celebration for Kirk's 101st birthday on Saturday," Michael captioned the heartwarming post. "At 101 Dad is a true amazement and a great time was had by all."
My brother Joel and I attend a family celebration for Kirk's 101st birthday on Saturday. At 101 Dad is a true amazement and a great time was had by all.Posted by Michael Douglas on Monday, December 11, 2017
Michael explained that the family celebrated Kirk's birthday by honoring some of the actor's greatest performances. For example, the sunflower cake was a trubute to his performance as Vincent Van Gogh in 1946's Lust for Life. A pair of boxing gloves from Kirk's first Academy Award nominated performance in 1949's Champion was also displayed.
Michael's wife, actress Catherine Zeta-Jones, also paid tribute to her father-in-law over the weekend with a sweet Instagram post calling him her "hero."
"101 today!!!! My darling Pappy on my knee," she wrote. "Happy Birthday to my wonderful, inspirational and loving father in law, Kirk. Love you with all my heart. ❤️#hero."
ET spoke with Michael and Catherine last month, when they revealed the secret to their long-lasting marriage.
"I think understanding, listening, being friends, all helps," Catherine shared. "It's been a great 17 years."