Article continues below advertisementDemi Lovato rang in her 33rd birthday with a night full of glam, music and nonstop fun.The singer kicked things off in a dramatic feathered jacket before switching into a zebra-print bandeau top and sleek black pants, flaunting her slimmed-down figure and toned abs.Article continues below advertisementSource: @ddlovato/InstagramThe 'Confident' songstress celebrated her 33rd birthday in a skimpy top.