You knew it was going to happen sooner or later -- Glee is doing a Whitney Houston tribute episode! And we have a first look at Mercedes, Santana, Kurt, and Rachel singing an absolutely gorgeous acapella rendition of Whitney's hit "How Will I Know."
The Whitney episode will air this coming Tuesday, and will feature an entire 42 minutes' worth of Whitney classics. There will likely be some eulogizing/memorializing for the late singer as well -- this sneak peek clip shows the New Directions kids building a short of shrine to Whitney in a locker.
Watch and listen after the jump -- this performance is sure to give you chills!