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!

If you've seen Glee star Amber Riley lately, you may have noticed something different about her -- she's sporting a much slimmer figure!

The actress recently told People all about her decision to "get healthy" and talked about the trouble her weight loss caused for the costume designers of Glee.

How did Amber drop two dress sizes? Find out after the jump!

The cast of Glee honored Whitney Houston during last night's Valentine's episode, titled 'Heart.' Just three days after her death, Whitney Houston was the beloved subject of a moving musical tribute on FOX's hit show -- by sheer coincidence.

Star Amber Riley covered her biggest hit, I Will Always Love You that was planned by Glee's team long before her death.Take a look at the touching moments via today's Hollywire Hot Minute!