TMZ has learned … the U.S. Secret Service just closed in on a woman accused of operating a serious  credit card scheme … and many of the alleged victims are major Hollywood mega-stars. According to an affidavit filed in United States District Court, a witness claims Jennifer Aniston, Cher, Liv Tyler, Melanie Griffith, Anne Hathaway and Scott Speedman were all violated — or at least their credit cards were — by a woman who ran a swanky salon in Beverly Hills called the Chez Gabriela Studio. According to court documents, Maria Gabriella Perez is accused of ripping off the credit card information from her ultra-wealthy clients … and “fraudulently [charging] approximately $280,000 worth of charges in a one year period.” According to the docs — Perez swindled $214,000 from Liv Tyler alone.