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The CNN host lost his brother in 1988.
Designer Diane Von Furstenberg shared some of the picturesque memories on Instagram.
These two are really good at summer.
The CNN host opened up about his friend and New Year's Eve co-host during an appearance with Andy Cohen on Friday.
Cooper previously condemned Griffin's controversial photo shoot on Twitter.
Andy Cohen Says Anderson Cooper is 'Moody as F**k,' Reveals Who He'd Like to Set Up Lady Gaga With
He also got sweet birthday messages from his celebrity friends.
The comedian held back tears at a press conference in Los Angeles, where she addressed the fallout from her controversial photo shoot with celebrity photographer Tyler Shields.
The 56-year-old comedian spoke out after receiving backlash for posing with a bloodied replica of President Donald Trump's head.
Anderson Cooper 'Appalled' by Kathy Griffin's 'Disgusting' Donald Trump Photo, Melania Trump Also Responds
The longtime pals sit down for the latest episode of 'Andy Cohen's Then and Now.'
Jerry O'Connell, Anderson Cooper and Andy Cohen all gave Seacrest their congrats.
Jerry O'Connell, Fred Savage, Christian Slater, Chris Hardwick and more have been considered frontrunners for the coveted spot!
Anderson Cooper returned to guest co-host 'Live' on Monday morning.