she's been completely starkers. She thinks it makes her voice sound better," said a source.
Lady Gaga kicked off her world tour in Seoul on April 27 and covered Hong Kong, Japan, Singapore, New Zealand and Australia.
Meanwhile, pop star Lady Gaga will perform her first ever concert in Russia in December, gig organisers said.
The December 9 gig in St Petersburg is part of the singer's Born This Way Ball tour, which kicked off in South Korea in April.
She will be supported by British band The Darkness.
Lady Gaga was due to play a gig at a musical award ceremony in Moscow earlier this year, but it was cancelled after the singer's agents said they could not secure the performance.
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(With additional inputs)