Katy Perry is the world's best-paid pop star.

The 30-year-old singer - who was married to British comedian Russell Brand from 2010 until 2012 - is the best-placed pop star on Forbes' annual list of the world's highest-paid celebrities.

However, her 2015 earnings of $135 million fall well short of the top name on the list, multi-weight World Champion boxer Floyd Mayweather, who raked in as much as $300 million over the same 12-month period.

Second place on the list went to Floyd's professional rival Manny Pacquiao, who earned $160 million.

Meanwhile, the top five on the list is rounded off by British boyband One Direction ($130 million) and Howard Stern ($95 million).

Other famous names to be featured on the list include Hollywood star Robert Downey Jr., singer Taylor Swift and soccer player Cristiano Ronaldo.

Last week, meanwhile, Taylor Swift and Calvin Harris were named the world's highest-paid celebrity couple, overtaking Beyonce and Jay Z at the top of Forbes' list.

The duo earned as much as $146 million over the last 12 months, with their respective endorsement deals helping them to take the top position on the list.