Ant Anstead and Girlfriend Renée Zellweger Wear Matching Halloween Costumes with His Son Hudson, 5: 'Shark Gang'

Anstead shares his son with ex Christina Haack

Ant Anstead couldn't miss out on dressing up for Halloween with his 5-year-old son Hudson.

On Friday, Nov. 1, the Celebrity IOU: Joy Ride host, 45, shared a series of photos on his Instagram as he celebrated Halloween with Hudson. Wearing a shark onesie, Hudson could be seen holding up pieces of candy in one photo and trick-or-treating in others as the father-son duo spent time together.

"Tell you what…. America knows how to do Halloween!!" Anstead wrote in his caption. "No messing about! And Laguna Beach is an all community event!"

"Hudzo desperately wanted to be a SHARK and he insisted the missus and I also were part of the shark gang (oh and we did!)," he added, referring to girlfriend Renée Zellweger. "Fun night but please NO MORE CANDY! X."

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Related: Ant Anstead Takes His 5-Year-Old Son Hudson Axe Throwing as He Shares New Photo: 'Little Axe Thrower'

Anstead shares Hudson with ex Christina Haack, 41. He is also dad to daughter Amelie, 21, and Archie, 18.

In October, Anstead shared a photo on his Instagram Stories of Hudson as the duo went axe throwing together. Pictured in front of a blow-up target and holding a blow-up axe, Hudson could be seen getting ready to throw as his proud dad snapped his photo.

"Little axe thrower..." Anstead wrote across the picture.

In September, Anstead shared a sweet Reel on his Instagram as he celebrated Hudson's fifth birthday. Anstead included a round-up of photos from throughout Hudson's life, including an adorable photo of the father-son duo posing together.

"Happy birthday Hudzo! WOW what a privilege it’s been to witness you become a bright, sparkly, funny, brilliant, generous magnetic, talented and kind little man," Anstead began his caption.

"You have taught me so much about so much! It’s been a privilege to do this dad thing all over again. You humble me and fill everyone around you with joy and love."

"NayNay and I love you very much! Happy 5th birthday Hudzo ❤️ x," he ended his post, referencing Zellweger, 55.

Haack commented on Anstead's post, writing, "Happy Birthday to our sweet boy!"