While a lot of fans did use the opportunity to wish Mr. Costner a very "Happy Birthday," some couldn’t help themselves and got a little snarky on the post. The top comment, for example, was a joke about your “ex” wishing you a happy birthday.

The "Yellowstone" actor shared a sweet photo of him and Houston on the set of 1992’s romantic thriller, "The Bodyguard," and reflected on how much he misses his former costar.

Kevin Costner turns 70 on Saturday (Jan. 18), and his fans shared their mostly overjoyed reactions after the official Yellowstone account on Instagram wished him a happy birthday.

Kevin Costner has marked his birthday by sharing a throwback photo of himself with his former co-star Whitney Houston, admitting that he is “lucky”. Costner, who recently left his the now-completed Yellowstone amid a shroud of controversy, turned 70 on 18 January and celebrated the occasion by looking back at his own life and celebrating Houston’s.

It’s the perfect day to celebrate Western legend Kevin Costner, especially when it comes to his decision to leave Yellowstone.

Kevin Costner shuts down rumors of a romance with Jennifer Lopez as he focuses on family and personal interests ahead of his milestone 70th birthday, following his recent divorce.