The 23-year-old actress went bra-less in a blouse that was slashed almost to her waist as she arrived at West Hollywood club Voyeur.
The Mean Girls actress is currently bracing herself for the internet release of a private video file.
Fronting it out: Lindsay Lohan arrives at Voyeur club in West Hollywood last night amid claims her sex tape featuring an unknown male will be leaked on the net
According to reports, a 47-second tape of the actress frolicking naked with a mystery male is currently being around LA.
But LiLo put on a brave face last night as she attended a party for a new luxury sex toy.
The star, who was lauded as a shining light and went to straight into the A-list as a teenage actress, joined Colombian Sofia Vergara at the rather tacky event.
Wearing a trilby, polka dot shirt, black leggings, cropped jacket and sky-high heels at the event, she accessorised with a spider necklace and a faint hint of a smile.
The man offering around the sex video is a waiter with a well-known chain restaurant, according to the Daily Mirror.
He has been told he has to release the footage to an 'offshore porn site', and it will then be available across the world.
At the beginning of the year, Lindsay wrote on Twitter about making a fresh start and was hoping to change her profile as a partying socialite.
On January 1, she told her Twitter followers: '2010 is about moving forward, not backwards. Leaving the bad (people, habbits, and negative energy behind) time to make changes-right!?!? :)'
She even made a documentary for the BBC on child poverty and women's rights in India and has been tweeting about the earthquake disaster in Haiti.
Now a source told the Mirror: 'This video file is dynamite. It is pretty seedy and shows Lindsay engaged in a particular sex act which, obviously, should remain behind closed doors.'
They added: 'If and when it is released on the internet, via a spurious, unofficial website, there is absolutely nothing she or her lawyers can do about it.'
In 2003, Paris Hilton's sex tape with Rick Salomon went all around the world. She tried to ban it but later agreed to its release and now receives profits from it.
Kim Kardashian also became a household name after a pornographic home video with then-boyfriend Ray J was leaked onto the internet in 2007.
