Michael Phelps, the most decorated Olympian of all time, has had to show the USA's newest swimming star Katy Ledecky how to wear a whole lot of medals all at once.

Well versed in the practice of winning and wearing multiple medals, Phelps acted as magazine stylist for a day in helping adorn Ledecky with her five Rio medals for a photoshoot with Sports Illustrated.

With just one Olympic medal to her name prior to Rio, Ledecky was lucky enough to have Phelps around to teach her the knack of medal arrangement, a skill that she may now have to pass on to future Olympic stars herself.

Phelps, Ledecky and gymnast Simone Biles will all appear with their impressive medal hauls on the cover of the latest editon of the magazine.