![FILE - In this Monday, June 12, 2017, file photo, Katy Perry performs during 'Katy Perry - Witness World Wide' exclusive YouTube Livestream Concert at Ramon C. Cortines School of Visual and Performing Arts in Los Angeles. The pop star’s “Witness: The Tour†is pushing back the start of her new tour to Sept. 19 in Montreal. Perry said in a statement Thursday, Aug. 17, that “major elements of my tour stage design could not be available for me to rehearse on until this week.†(Photo by John Salangsang/Invision/AP, File)](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/AH5MKGEF5WWR5CV7J5KUYJGQOQ.jpg?smart=true&auth=cea6b4cff13e6e609fdbd70b7fc051cd88cbf51bea38236924d526cce062304b&width=400&height=225)
US singer Katy Perry, who is currently expecting her first child, will perform at Tomorrowland Around the World. AP
US singer Katy Perry, who is currently expecting her first child, will perform at Tomorrowland Around the World. AP
Katy Perry to perform at Tomorrowland online festival: 'I hope my set makes you smile'
The heavily pregnant US singer will play all her hits from a virtual stage