Pop star Britney Spears (R) and hotel heiress Paris Hilton (L), dubbed the "Screamgirls" by Mr. Blackwell, landed at the top of the former designer's annual worst dressed list on Tuesday. (File Photo) Photo Gallery >>>

    BEIJING, Jan. 10 -- Pop star Britney Spears and hotel heiress Paris Hilton, dubbed the "Screamgirls" by Mr. Blackwell, landed at the top of the former designer's annual worst dressed list on Tuesday.

    The celebrities, who forged a friendship at Hollywood and Las Vegas nightclubs last year, were also described by Blackwell as "style-free and fashion deprived." The wife of Britain's Prince Charles, teen star Lindsay Lohan and singer Christina Aguilera were also subjected to his sartorial skewering.

    Spears, whose fashion choices made headlines in late 2006 when photographs of her stepping out of cars showed she wasn't wearing panties, has been a favorite target of Blackwell for the past six years.

    The self-appointed style guru made no direct reference to the singer's underwear choices, but described Spears and Hilton as "two peas in an overexposed pod."

    Blackwell's list has become a Hollywood tradition over the decades, poking fun at icons ranging from Queen Elizabeth to Elizabeth Taylor. Blackwell was one of the top Los Angeles designers of the 1960s, creating fashions for the likes of Jayne Mansfield, Peggy Lee and Nancy Reagan.

    He urged the women on his 2006 list to emulate "fabulous fashion independents" like Kate Winslet, Angelina Jolie, Helen Mirren, Barbra Streisand and Beyonce Knowles.