Jason Momoa has apologized to fellow Hollywood star Chris Pratt after shaming his use of plastic water bottles on Instagram.

Pratt posted an ad to his Instagram page which showed him wearing gym gear while holding a plastic water bottle. Momoa was quick to call him out for it.

The Aquaman star commented: "bro I love u but wtf on the water bottle. no single use plastic. come on."

In response, Pratt wrote back: "Aquaman! You're completely right. Dammit. I always carry my big gallon size reusable water jug around with me too. I even had it that day!!!

"If I remember correctly somebody threw that plastic bottle to me in the photo shoot cause I didn't know what to do with my hands! 

"I never know what to do with my hands! So uncomfortable. For real tho. Love you too buddy. My bad. I don’t want your home of Atlantis covered in plastic. Hear that kids? Reduce. Reuse. Recycle."

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Momoa later regretted the comment and issued an apology to the Guardians of the Galaxy star.

Posting a picture of himself and his children with Pratt, Momoa said on Instagram: "BRO you know my children and I are madly in love with you and I love everything you do. I’m sorry this was received so badly today I didn’t mean for that to happen.

"I’m just very passionate about this single use plastic epidemic. The plastic water bottles have to stop I hope u make a reusable water bottle for Amazon so we all can purchase. You’re an inspiration to many I’m one of them."

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In April, former Game of Thrones star Momoa shaved his much-loved beard off in a bid to raise awareness of recycling and to launch a water product that comes in a recyclable aluminium can.