If we're talking bromances, Dwayne Johnson and Kevin Hart have one of the best in Hollywood.

The pair has become well-known over the past few years for their fabulous banter that has a habit of turning savage.

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But their most recent hilarious exchange took a rare delve into the serious, as The Rock took to social media to encourage people to vote in the 2018 US midterm elections, which see Republicans and Democrats vying for control of Congress.

Posting a picture of himself holding a child with Hart's face super-imposed on top, he implored his followers to get out and cast their vote for the 'children'.

"Get out and VOTE. Don’t do it for me. Do it for our little ones," he wrote.

The 46-year-old's post was well-received by fans online, many of whom praised him for tying in an important political message with a slam-down of Hart.

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"Yes this just made my day. Thank you sir. Well done !!!!" wrote Instagrammer @tuga.13. He was joined by @pasteur_science who laughed "Wow what a savage troll ???" and @pippa_edmunds, who joked: "@therock ?@kevinhart4real is so lucky to have a Daddy like you. ?".

The pair are infamous for their amusing putdowns on social media. Only a few days ago, Johnson joked about the 39-year-old comedian's height again on Instagram, opening up about their friendship in the process too.

"Taking care of business," he wrote. "Great having my son, I mean one of my best friends @kevinhart4real stop by my set of HOBBS & SHAW (our FAST & FURIOUS spin-off film) to have a big meet up about new opportunities."

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He continued:

"We f**k with each other ? all the time because it’s what we love to do and the world loves it too, but we also have a mutual hunger to build out our enterprises and create opportunities that entertain the world. We’re lining up some very big things for the world to enjoy. I still want to slap his little lips into next week though ??? #OnSet #HobbsAndShaw #TakinCareOfBusiness #RockHartConnection ?@kevinkwan327".

Last year, the American wrestler also spoke further on their bromance, stating he sees Hart as a "brother".

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"We met each other for the first time probably two or three years ago at an awards show," he told The Hollywood Reporter. "But we always knew we wanted to work with each other. Since working with him I can honestly tell you that I've never had this type of brotherly chemistry with anyone that I've worked with and it's a cool thing."

"It's like having a brother," he added. "We talk shit to each other. We give each other shit. We compete with each other but we have fun."

Whatever you're doing, keep on doing it boys. And remember America - vote like your life depends on it.

Dwayne 'The Rock' Johnson trolls Kevin Hart with hilarious picture encouraging people to vote