US TV
WENN
The 'Reach Out' singer joined the cast of the popular CW series in July.
The 21-year-old refused to come out of her trailer to shoot a scene at New York City's Gramercy Park, the New York Post reports.
"No-one could believe they would actually hold up taping for her. Nobody in the cast behaves like that," a source told the publication.
However, a rep for the teen drama said that the report is "absolutely not true".
Duff's first appearance on the series will air on October 5, while the third season of Gossip Girl premieres on Monday, September 14 on The CW.
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