You Don't Know Me Jax Jones Feat. Raye
Chris Martin, Ellie Goulding, Mark Owen, Peter Kay and Lulu are among the stars joining Gary as reaches the big 4-0!
When Gary was asked what he wanted to do to celebrate his 40th birthday he said play a concert for family, friends and fans...so that's just what he did at the Shepherds-Bush-Empire.
Gary belted out hits old and new and money from the bash went to charity.
Gary was joined on stage by some famous faces including Coldplay's Chris Martin.
Gary in familiar pose behind the piano
Gary with Ellie Goulding
David Walliams, Peter Kay, Lulu and Kimberley Walsh were in the crowd, as was James Corden.
Take That colleagues Mark Owen, Howard Donald and Jason Orange joined him on stage
Gary will be hoping for more partying next month when Take That are up for two BRIT awards and perform at the O2.
Gary Barlow and Mark Owen
Happy Birthday Gary!