They're both celebrities beloved of advertising agencies -- and now Kevin Hart and Usain Bolt appear in one together, facing off in a campaign for online poker site Pokerstars.

The campaign, by Gravity Road, sees the two face-off in a battle of wits on social media that will culminate in a battle at the poker table in the Bahamas in January 2018. Ahead of the poker game, fans will be able to vote for one or the other according to who they think is winning in the social media stakes.

Hart's and Bolt's rivalry started four years ago when they raced each other on the basketball court at an NBA All-Star Celebrity Game. The spot sees the two trying to think of ways to beat each other, with Bolt seen reading a book called "Break the Internet" and Hart holding aggressive press conferences.

Previous campaigns by Pokerstars have seen sports superstars Neymar da Silva Santos Junior and Ronaldo Luis Nazario de Lima, and then Cristiano Ronaldo and Dwyane Wade, battle it out.