Blake Lively says photos that are circulating around the web claiming to be the actress without any clothes on are fake.
"The photos of Blake Lively which have just surfaced on various websites including Perez Hilton and Zap2it are 100 percent fake," US Magazine quoted the actress' representative as saying.
The actress is threatening to sue any publication that reprints the photos, which show a blonde woman taking pictures of herself in the nude, the magazine reports.
The rep said that Lively, 23, has never taken nude photos of herself.
Lively became the stand-out actress in CW's "Gossip Girl" and has since caught the eye of directors and fashion heavy-weights like Anna Wintour and Karl Lagerfeld. The actress was made the face of the French fashion house Chanel earlier this year.
Lively was recently linked to actor Leonardo DiCaprio after they were photographed hugging on a yacht during the 2011 Cannes Film Festival in France, days after it was reported DiCaprio and Israeli supermodel Bar Refaeli had broken up. The two have not commented on the nature of their relationship.
Lively stars alongside Ryan Reynolds in the upcoming film, "The Green Lantern," which is set to be released on June 17.