The Internal Revenue Service has filed a $531,720 tax lien against supermodel Christie Brinkley.

The tax lien was filed in the Suffolk County Clerks Office against the actress’s $30 million estate in Bridgehampton, N.Y. Brinkley’s publicist told E! Online that the 57-year-old model was surprised to hear about the tax lien and she has “instructed her team to resolve the matter immediately.”

Brinkley later told TMZ, "I regret not paying more attention to my accounting, but I have been, and remain focused on my whole family as both my parents navigate serious health issues." She added that her taxes would be paid in full by Wednesday, December 7, and she expected the IRS to release the tax lien immediately thereafter.

Brinkley was formerly married to singer-songwriter Billy Joel and inspired his hit “Uptown Girl.” She reportedly has an $80 million fortune. She recently starred in the Broadway musical “Chicago” and launched a line of anti-aging skin care products.