According to People, the 88-year-old revealed the news at Elton John's Oscar party, but remained perplexed as to why fans would want her on the sketch comedy show.
"I don't know why or how," she said. "But it's been wonderful."
The Golden Girls star also remained quiet as to what the guest starring role will entail.
It was thought that the actress would appear on a 'Women Of Comedy'-themed episode featuring former SNL alumni Tina Fey and Amy Poehler, but creator Lorne Michaels has since denied such a claim.