Paris Hilton didn't need cue cards for her mock presidential ad poking fun at John McCain's campaign for disparagingly linking Barack Obama with her.

The 24-year-old celebrity heiress memorised her entire monologue, which included Hilton outlining her energy plan, in an online video spoof posted on Funny or Die, the comedy Website's content director said.

Co-founder Adam McKay came up with the concept for a mock ad starring Hilton, which has received over 3 million views since it was posted on Tuesday.

Last week, McCain launched an ad comparing his Democratic rival Obama to Hilton and Britney Spears, suggesting Obama was no more than an empty celebrity candidate unready to lead the US.

Hilton initially shied away from the debate over the ad and its effectiveness.

But she responded Tuesday with the Funny or Die spoof.

"Adam thought it would be really funny to get Paris to respond to the John McCain ad that featured her," Funny or Die content director Amy Rhodes said.

In the online video, Hilton -- clad in a leopard-print swimsuit and heels while lounging poolside -- announces her candidacy for president and suggests an energy plan that combines elements of McCain's offshore oil drilling plan and Barack Obama's incentives for new energy technology. She also suggests a running mate: R&B singer Rihanna.