Rapper MC Hammer is facing a new set of financial woes - the star allegedly owes more than $600,000 in unpaid taxes.

The star, real name Stanley Burrell, famously declared himself bankrupt in 1996 after squandering his multi-million-dollar fortune on his lavish lifestyle. The U Can't Touch This hit-maker launched a reality show, called Hammertime, in June to get his career back on track - but now he's dealing with a second round of money difficulties.

U.S. government officials have filed three separate liens against him this year that add up to $671,182. The three demands include a...