11-year-old Olivia Lynes gives an astounding performance of 'Defying Gravity' from the musical, Wicked. See more from Britain's Got Talent at http://itv.com/BGT SUBSCRIBE: http://bit.ly/BGTsub Facebook: http://www.facebook.com/BGT Twitter: http://twitter.com/BGT Instagram: https://www.instagram.com/bgt/ TikTok: https://www.tiktok.com/@bgt