As behind the scenes pictures from earlier this week already confirm, Glee is currently filming it’s big disco tribute — Season 3, Episode 16: “Saturday Night Glee-ver.”

The April 17 episode, a Bee Gees tribute featuring songs from the hit John Travolta movie Saturday Night Fever, has already garnered speculation that a certain white suit-wearing superstar might make an appearance.

Last we heard, Glee producer Ryan Murphy was thinking about asking John to make a cameo appearance. But we have no idea if the whole thing actually went through. Then, on March 1, Amber Riley (Mercedes) tweeted, “I'm omw to work now! About to watch a special guest perform!”

Is it possible? Do we dare to dream that the special guest to whom she’s referring is none other than Travolta himself?!

Kind of a stretch, we know. Plus, John’s voiced some hesitation about appearing on Glee in the past, since he likes to have more time to train and prepare for musical roles than Glee’s hectic schedule would allow.

Plus, there are a number of other options for the “special guest” to which Amber refers. The Bee Gee’s Barry Gibb is reported to be “teaming up” with Ryan Murphy for this episode. Perhaps that entails a special guest performance, as well?