Justin Timberlake, Jay Z, Nas and Timbaland have hit the recording studio to work on new music. A photo of the stars laughing and drinking together around a keyboard was posted online on Wednesday (05Jun13) by Lenny S., an executive at Jay Z's label Roc Nation, alongside the caption, "Jay x Jt x Nas x TIMBO Rat Pack s**t. For some this is 'Work'... For us it's just Fun."