The 'Happy' singer was flown by private jet to Monte Carlo for the birthday party of Romania's richest man on Saturday (05.12.09).

Leona sang a short set for 25 guests in the exclusive show at a private banqueting suite in the state's Hotel De Paris.

The singer then flew to Germany where she wowed millions of TV viewers with a performance on hugely popular show 'Wetten Dass' yesterday (07.12.09), for which she wore a short white dress.

Although she agreed to perform at the private party, Leona has previously turned down other lucrative earning opportunities. Last month, it emerged Leona had been offered over $1.5 million to appear naked in men's magazine Playboy.

Although she was 'flattered' to have been asked to appear in the pages of the publication, Leona is simply too shy to strip off for a shoot.

She has previously said: 'I'm not that confident! I just don't think I could pose nude, because I'm not that brave."

Leona is not the only pop star to cash in with a private performance.

Rihanna is reportedly set to earn $500,000 to perform at a New Year's Eve party (31.12.09).

The 'Umbrella' singer has been asked to sing at the Emirates Palace Hotel in Abu Dhabi to help revellers see in 2010 in what will be her first performance in the Middle East.