Katy Perry performing at Barack Obama rally

Katy Perry is to perform at a rally with US President Barack Obama later today (October 24).

The 'Firework' singer is to appear at one of the politician's rallies in Las Vegas to drum up support for his re-election campaign, according to The Hollywood Reporter.

Katy Perry at Comedy Central's 'Night Of Too Many Stars: America Comes Together For Autism Programs'
Obama/Romney second debate at Hofstra University, NY

PA Images / Charles Dharapak / AP

Las Vegas's Doolittle Park will host the event - which is being billed as a block party - from 6pm local time.

Perry previously performed for Obama at a Los Angeles fundraiser earlier this month, which was also attended by Jon Bon Jovi and Jennifer Hudson.

The artist later took to Twitter to explain to followers that she is endorsing Obama because she believes in "equal rights for all", an apparent reference to the President's pro-gay marriage stance.

Perry's appearance at an Obama rally will come just one day after Bruce Springsteen headlined a free concert for the President's supporters in Virginia.

Watch Katy Perry perform 'Firework' below: