Elton John honors George Michael with performance of their hit duet at Las Vegas concert: Watch

Elton John honored his late friend George Michael during his concert in Las Vegas on Wednesday night (Dec. 28).

In front of a large photo of Michael projected above the stage, John opened the show with "Don't Let the Sun Go Down On Me," which he originally recorded in 1974.

Michael and John performed the ballad together at the Live Aid concert in 1985, and at Michael's Wembley Arena concert in 1991. The duet was recorded and released at the end of 1991, and ended up topping the Billboard Hot 100 in 1992.

Former Wham! singer and solo artist George Michael passed away on Christmas Day due to heart failure at his U.K. home. He was 53.

John tweeted a photo after the death of his friend and collaborator, writing: "I am in deep shock. I have lost a beloved friend -- the kindest, most generous soul and a brilliant artist. My heart goes out to his family, friends and all of his fans."

Wednesday's concert was the first in a series of four New Year's shows, called The Million Dollar Piano, that the 69-year-old entertainer is performing at Caesars Palace.

PHOTOS: Elton John and George Michael through the years

Elton John and George Michael together
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Elton John and George Michael together
LONDON - MAY 1985: Pop singers Elton John and George Michael chat in a film studio in May 1985 in London, England. (Photo by David Corio/Michael Ochs Archives/Getty Images)
Pop star Elton John (right) congratulates George Michael on winning the Ivor Novello Songwriter of the Year Award at London's Grosvenor House Hotel, 13th March 1985. (Photo by Dave Hogan/Hulton Archive/Getty Images)
Singers George Michael and Elton John at the Gianni Versace 'Men Without Ties' launch party in London, 14th June 1995. (Photo by Dave Benett/Getty Images)
George Michael & Elton John (Photo by SGranitz/WireImage)
Elton John onstage with George Michael in the late 1980's.; (Photo by Steve Rapport/Photoshot/Getty Images)
George Michael & Elton John in Santa Barbara, California (Photo by Steve Granitz/WireImage)
Elton John onstage with George Michael performing live in the early 1990's.; (Photo by Steve Rapport/Photoshot/Getty Images)
UNITED STATES - JANUARY 01: Photo of George MICHAEL and Elton JOHN (Photo by Ebet Roberts/Redferns)
Pop stars George Michael (top) and Elton John leave Westminster Abbey after the funeral service 06 September of Diana Princess of Wales. The Princess was killed in a car crash in Paris 31 August. (Photo credit should read JOHNNY EGGITT/AFP/Getty Images)
Singers Elton John (centre) and George Michael leaving Westminster Abbey after the funeral service for Princess Diana, Princess of Wales, 6th September 1997. Elton John's partner David Furnish is on the right. (Photo by Jayne Fincher/Getty Images)
George Michael, Whoopi Goldberg, Lionel Richie, Liz Taylor and Elton John performing at a benefit concert for the Elizabeth Taylor AIDS Foundation at Madison Square Garden in New York City on October 11, 1992. (Photo by Ebet Roberts/Redferns)
LONDON, UNITED KINGDOM - NOVEMBER 06: (EXCLUSIVE COVERAGE) (DOUBLE SPACE RATES APPLY) Musicians George Michael and Sir Elton John attend a charity performance benefiting the Elton John AIDS Foundation's newly created Elizabeth Taylor Memorial Fund at the Royal Opera House on November 6, 2011 in London, England. (Photo by Caroline True/Getty Images)

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