Don't Let Me Down, Justin Timberlake & Leona Lewis!

Justin Timberlake sneaks out the back door of West Hollywood’s Guys & Dolls nightclub on Tuesday night (August 18). Earlier in the day, the 28-year-old actor was seen at a Hollywood recording studio.

Earlier this week, a track by Leona Lewis and Justin titled “Don’t Let Me Down” leaked onto the Internets (reportedly the first single from the X Factor winner’s next album). SyCo, Simon Cowell‘s division of Sony Music Entertainment, is not happy and is on the hunt to find out who stole the track.

“The police investigation is ongoing,” Jeremy Banks, head of IFPI’s Internet Anti-Piracy Unit, tells THR. “Such pre-release leaks, however they are sourced, are highly damaging to our members who invest considerable budgets in marketing and promoting music ahead of release.”

A rep from Sony Music tells JustJared.com, “Many tracks which have been stolen from UK based label Syco are very early demos, some not even containing vocals – no track listing has been confirmed for the album yet. There is no saying at this stage whether or not this track will be on the record. It’s from very early stages of the recording process, is unfinished and stolen.”