The actress learned guitar and singing for her new movie Country Strong - and said at the beginning of the famed US comedy show that country music had become 'my life'.
Then a Kenny Rogers lookalike came out - and Gwyneth giddily cried: 'Garth Brooks!'
The joke that she doesn't really know anything about country music continued as she didn't know any of the lyrics of Rogers's big hit Islands In The Stream, as a Dolly patron lookalike joined them.
She thought she was saved by Cee Lo Green coming out - but he, too, just wanted to sing Kenny's country classic.
But the highlight was when she played Taylor Swift - singing at a Bar Mitzvah.
Paltrow - who joked at the beginning of the show that she 'took some time off to be British, which was smashing and brilliant' - also impersonated another famous face: Heidi Klum.
She pretended to be the German supermodel trying to get a job as a CNN presenter with shamed former New York governor Eliot Spitzer.