Paris Hilton lost a $350,000 ring because she was tired.

The 34-year-old heiress accidentally left the diamond jewellery in an SUV taking her across the tarmac to her private jet at an airport in Lodz, Poland, and blamed her exhaustion from her hectic work schedule for her carelessness.

Paris told TMZ she was very tired because she had performed in Ibiza the night before, flown into Poland and worked all day before jetting back to the Spanish island.

The DJ-and-socialite is now trying to get the contact details of the firefighter who found her ring so she can give him a reward and send some gifts for his family.

Last month, Paris was left shocked after four of her neighbours were robbed at gunpoint.

The 34-year-old socialite took to Twitter to reveal the terrifying news, writing: ''Last night 4 of our neighbors houses got robbed at gunpoint. Thank God my boyfriend has such an amazing security team at his house (sic).''

While Paris did not specify where she was, she is believed to be spending most of the summer with her boyfriend, 39-year-old Thomas Gross, at his home in Ibiza.

Paris is DJing at the nightclub Amnesia every Saturday until September 12.