Kevin and Susan had become a fixture in the closing days of the Festival with the pair reuniting for the Better World gala on Thursday, while Kevin promoted the second and third part of his Western epic on Friday and Saturday.
Kevin wasn't alone for the Venice Film Festival as son Cayden Wyatt Costner also joined his father for some red carpet appearances.
Scroll down to the best famous faces from the closing day…
1/11
Kevin Costner
Kevin is both directing and starring in Horizon: An American Saga, and the actor looked worlds away from his hero. The star looked suave in a grey suit as he attended the premiere for his latest flick.
2/11
Susan Sarandon
Susan made sure to support her close friend at the premiere of his film and the actress looked beautiful in a black pantsuit with a glimmering silver jacket.
3/11
Alexander Skarsgard
Succession star Alexander looked so suave at the event as he rocked a custom Calvin Klein black double breasted Italian wool suit jacket with grosgrain lapels and straight leg trousers, paired with a white organic cotton shirt and silk grosgrain bowtie.
4/11
Sienna Miller
Sienna made sure to turn heads for the final red carpet of the Festival, as she rocked a see-through dress with thigh-high black boots.
5/11
Luke Wilson
Luke following in Kevin's footsteps when it came to his red carpet fashion choice, with the actor choosing a grey suit for the occasion.
6/11
Pedro Almodovar
Acclaimed director Pedro was in a jubilant mood as he won Best Film at the Festival's awards ceremony.
7/11
Kathleen Quinlan
Academy Award-nominated actress Kathleen looked stunning at the Horizon photocall in an all-white ensemble.
8/11
Chad Lindberg
Chad will eb starring alongside Kevin in the Western epic and the Supernatural star rocked quite the tuxedo!
9/11
Abbey Lee
Abbey made an appearance as Marigold in Horizon's first film and the Australian model supported her former co-star and looked phenomenal in a lacy black and white number.
10/11
Isabelle Fuhrman
Isabelle is starring as Diamond in the Horizon series and the glam star looked ravishing in her black tulle dress.
11/11
Cayden Wyatt Costner
Kevin wasn't just supported by his co-stars at the premiere, but his teenage son Caleb Wyatt also joined his father. The 17-year-old looked dapper in a tan suit with a black shirt.
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