Janet Jackson displays biceps

Sporting a tight white vest and jeans, the 44-year-old singer gave a full display of her muscles at America's Gibson Amphitheatre, suggesting a rigorous work-out, reported the Daily Mail.

The 'All For You' hitmaker, who has long suffered weight problems, seemed incredibly toned, a contrast from her heavier look four years ago.

"There was a time when I was so down and felt so unattractive and it lasted for a very, very long time. I used to bang my head against the wall.

"The person that I was with, my ex-husband at the time, I mean, he'd have to stop me," Jackson had said about her struggle to control her weight.