The singer was a close friend of Harry's mum Diana and famously sang Candle in the Wind at her funeral in 1997.
Meanwhile, Prince Harry and Markle's other celebrity wedding guests include Priyanka Chopra, Janina Gavankar, George Clooney, Amal Clooney, Spice Girls, James Corden, Patrick J. Adams, Troian Bellisario, Gabriel Macht, and more.
However, according to TMZ reports, it is still unclear whether he will be playing during the ceremony itself or performing at the reception later in the evening.
As you may know, Elton and Diana were close friends who worked together to raise money for AIDS research and awareness. Elton's Vegas shows were rescheduled months ago due to a "scheduling conflict". He will sing at the royal wedding 21 year after singing at Princess Diana's funeral.
Iraqis protest in Kirkuk over alleged voting fraud
Saturday's election was the first since the defeat of Islamic State of Iraq and the Levant (ISIL). Roughly half of Kirkuk's population is Kurdish, with around a quarter Arab and a fifth Turkmen.
Linked Company Nears Deal to Bail Out Jared Kushner Property
The Canadian controlled property owner has executed similar developments in NY and other cities around the world, the source said. The deal would have included $ 500 million from the sheikh's investment firm, contingent on investment from others.
GQ Publishes Mock 'Apology' for Cover of Women Comedy Stars
The magazine said it "deeply regrets" that the cover violated GQ's "rigorous standards of editorial excellence" and "the laws of nature".
He said: "If they asked me to - but I haven't been asked to the wedding yet". During an appearance on ITV's Lorraine, he said: "I spent some time with him in Sicily last summer and I could tell that he was totally in love, and he didn't really discuss much personally but he said, "I'm in love" and I thought, "Good for you". She would be proud of her boys".
"She was very much loved". And I am proud of them. The wedding is taking place at St George's Chapel in Windsor.
Sheku Kanneh-Mason, a 19-year-old cellist who won BBC Young Musician 2016 and made his BBC Proms debut the following year, will also perform at the royal nuptials.
Despite initial claims that he has not received an invitation to the nuptials, TMZ reported that John will indeed play at least one song at the May 19 event.