Friends and family gathered on Sunday to honor Alan Thicke, who died at age 69 on Tuesday after suffering a heart attack while playing hockey at a skating rink in Burbank, California.
A source tells ET that about 150 people attended the beautiful, heartfelt memorial service that took place at Thicke's ranch in Carpinteria, California, an oceanside city near Santa Barbara.
The source adds that the actor's son, singer Robin Thicke, and his two brothers welcomed guests, and were specific in wanting something upbeat and beautiful to celebrate their dad's life.
Robin hosted the service, the source says, telling stories about his father, and inviting guests up to share stories of their own about Alan, after starting the night off with a prayer.
Stars like Bob Saget, Bill Maher, Alex Trebek and the entire cast of Growing Pains, including Leonardo DiCaprio, spoke about how much Alan had meant to them. Kris Jenner sat next to Alan's widow, Tanya, for the evening. Other celebrities in attendance included Kevin Costner, Barry Bonds, Luc Robitaille, David Foster and Paul Mitchell.
A source close to the family previously told ET that Robin "really stepped up" in planning his father's memorial.
PHOTOS: Alan Thicke on 'Growing Pains'
"[Robin's] realized that he has to be incredibly strong for his family right now," the source said. "He is focused on honoring his dad, and making this easy on his family."
According to the source, Robin personally arranged all travel for out-of-town family members, securing local hotels and even offering to let them stay at his home.
"He knows he has to be strong for his brothers, and is focused on making this as easy for Carter as possible," the source added.
In addition to Robin, Thicke and his first ex-wife, Gloria Loring, also share 41-year-old son Brennan. He also had a son, 19-year-old Carter, with his second ex-wife, Gina Tolleson.
ET spoke with Loring over the phone from her home in Lake Arrowhead, California, on Wednesday, where she reflected on some of her most precious memories with the beloved actor.
"[Alan] loved his family so much," Gloria explained. "He was the centerpiece to our family and I can't imagine going forward. We always had Thanksgiving and Christmas with the big, extended family, and I just can't imagine how it's going to be without him."
"Alan loved his kids, loved his grandkids -- he was known as 'Pops,' and I think my son could speak best to their relationship with him, but I know it was always one of a mentor, a counselor, a supporter," she continued. "He was always there when they needed him. He was very devoted to his family and he was always so much fun to have in the room anywhere he was -- his sense of humor went before him."
The Canadian actor, who was best known for his role as patriarch Jason Seaver on Growing Pains, recently appeared on season two of Fuller House, as well as the pilot episode of the NBC drama This Is Us.
He is survived by wife Tanya Callau and three sons, Brennan, Robin, and Carter.
PHOTOS: Alan Thicke through the years