Sources told the New York Post that Lohan, who has been living in London, spoke in a British accent at the party, lashed out at someone she spotted taking photos of her and played Brandy and Monica's The Boy is Mine over and over again during a DJ set at Justin Etzin and model Lana Zakocela's nuptials in Florence last week (ends21Aug15).

Another wedding guest alleged the actress was "running around naked saying she was drugged" in her villa, while reports suggest items of jewellery were stolen from her.

But a representative for Etzin insists, "None of those things are true."

Lohan and her representatives have yet to address the story.