Fame makes the world small. In no way is that more obvious than when you consider the unexpected celebrity friendships that spring up, thanks to the overlap of Hollywood and the worlds of music, politics, and business.

Axar.az presents some unexpected friendships of celebrities:

1.Kevin Hart and Dwayne Johnson

Dwayne "The Rock" Johnson is (literally and figuratively) one of the biggest men in show business. Meanwhile, comedian Kevin Hart is no slouch when it comes to fame—he's one of Forbes' richest celebrities of the year—but his stature is, well, more diminutive. But the Central Intelligence and Jumanji costars have a genuine bromance going, onscreen and off; just watch them try to impersonate each other. Johnson originally requested Hart as his costar because of the comic potential in their physical differences, despite never having worked with him before. Since then, the practical jokers have played pranks on each other that would annoy most friends, but seem to keep getting a kick out of their relationship.

2.Ryan Gosling and Ryan Reynolds

Two Ryans. Two Canadians. Two A-list actors with male-model good looks, adoring fan clubs, talented wives, and enviable young families. It would be easy to think that Ryan Reynolds and Ryan Gosling would view each other as the competition, given their similarities. But instead, they're completely friendly, joking about their similarities and further proving that we simply don't deserve these two.

3.Elton John and Eminem

Detroit's fiery rapper and the British music legend may seem like an odd pairing, but the two have been fast friends ever since a duet performance in 2001 at the Grammy's. That performance came in the wake of accusations leveled at Eminem for purportedly homophobic lyrics in the The Marshall Mathers LP. (It was a controversial duet; GLAAD was one of the groups protesting the rapper, while Elton John is also a GLAAD honoree.) Later, Eminem reportedly reached out to Elton John first when he was confronting his own substance abuse issues, and sent John a gift for him and his partner following their civil union.

4.Bette Midler and 50 Cent

From working together to restore a community garden to joking about collaborating on musical endeavors, the iconic performer and the rapper have proven they are true longtime pals who just get each other.

5.Barack Obama and Richard Branson

It was a bromance that left the country breathless: Barack Obama, just weeks after leaving the White House, was documented hanging out with Virgin founder Richard Branson at his private island in the British Virgin Islands in early February. In a blog post, Branson shared details about their sun-and-surf activities, including their face-off in a friendly watersport competition—which Obama won with his newfound kitesurfing skills. "On his next visit, we plan to do the long kite over to Anegada together," Branson mused. Looks like this is one budding friendship that's here to stay.