Justin Timberlake joined his NSYNC bandmates on Monday nightto celebrate JC Chasez’s 40th birthday. The 35-year-old singer donned his favourite trilby hat as he posed for a snap with birthday boy JC, Chris Kirkpatrick, Joey Fatone and Lance Bass – sending fans of the 90s boy band into meltdown. “JC’s 40th… And, if you don’t