Lady Gaga & Elton John's Incredible Grammys Duet (VIDEO)

04/02/2010 05:12 am ET | Updated May 25, 2011

Lady Gaga opened the Grammys with a pantsless performance of 'Poker Face' before one of her backup dancers dumped her into a "Rejected" bin. She emerged covered in ashes and sat down at a duel piano across from...Sir Elton John!

Elton and Gaga, both smeared in ashes and encrusted in glitter, dueted a pretty awesome mash-up of her 'Speechless' and his 'Your Song' as disembodied arms flashed her monster claw move from the top of the piano.

Elton customized his lyrics during their remix of 'Your Song': "How wonderful life is with Gaga in the world!"

WATCH: