Lindsay Lohan is facing court action over nearly 94,000 US dollars that the federal government says she owes in unpaid taxes.
The case, relating to the 2009 tax year, has been filed in Los Angeles County.
It was first reported by celebrity website TMZ on the same day a paparazzo sued the model-actress for being in a car that allegedly struck him in Hollywood in January 2010.
Lohan's publicist, Steve Honig, said the star's finances are nobody's business but her own.
As for photographer Grigor Balyan's lawsuit seeking unspecified damages against Lohan, Mr Honig said he has not seen the case but accused the paparazzi of invading her privacy daily.
The actress is continuing to serve morgue duty to comply with her probation in a pair of misdemeanour cases.