Rapper Flo Rida has been hit with the ultimate embarrassment - he's been served with a lawsuit via Facebook.com.

The "Low" hitmaker, real name Tramar Dillard, allegedly owes Australian promoters a whopping sum for failing to play a gig at the Fat as Butter music festival last October, despite receiving a $55,000 advance.

Lawyer Matthew Hourn failed to track down the rap star in person, so he finally served the 32 year old with the legal notice via a link on his official social networking site.

Hourn tells Australia's Daily Telegraph, "Our process server tried arranging meetings with his agents and attended appearances in Melbourne - but due to his large entourage and security, we were unable to serve him personally."