The entire 'Growing Pains' cast attended Thicke's memorial, along with other celebrities like Alex Trebek, Bob Saget and more.
"When Alan Thicke walked in the room, quite frankly, no one was cooler," wrote DiCaprio, who was in the final season of 'Growing Pains' as homeless teen Luke Brower.
DiCaprio also handed Trump a copy of climate-change documentary 'Before the Flood,' which Trump promised to watch.
Rose McGowan, Leonardo DiCaprio, Susan Sarandon and more also celebrated on social media.
Celebrities like Shailene Woodley, Mark Ruffalo, Pharrell Williams and more have lent their support to the Standing Rock Sioux Tribe in opposing the controversial Dakota Access Pipeline.
Leonardo DiCaprio is reportedly in talks to make a movie based on the '90s cartoon series 'Captain Planet.'
The 2006 origin film was a critical hit and won the Oscar for Best Picture.
Kendrick Lamar, Adele and Caitlyn Jenner also made the list, which honors the most influential figures in the world.
“You will always remember where you were / When Leo got f----d by a bear,” rapped hosts Kevin Hart and Dwayne 'The Rock' Johnson.
Jennifer Lopez says that the Academy Award-winning actor was totally cool about the prank James Corden played on him from her cell phone.