WATCH: Amber Riley Sings "I Will Always Love You" on 'Glee'

Fox's hit show honored the late pop diva by singing her song -- but the episode was already planned before Houston's death

On Tuesday night's Valentine's Day episode of Glee, Mercedes (Amber Riley) belts out an emotional version of Whitney Houston's "I Will Always Love You."

But those who think the producers scrambled to include the segment in the love-themed episode as a tribute to the late pop star would be wrong. It was purely a coincidence, as the cover was recorded for the episode long before Houston died on Feb. 11.

The producers not only decided to keep the touching performance in the show, but they also devoted the entire episode to Houston.

Mercedes launches into Houston's top-selling single (a Dolly Parton cover which is currently the no. 1 downloaded single on iTunes) after a heartbreaking moment with her love-interest Sam (Chord Overstreet).

At the end of the episode, a title card pops up saying: "Whitney Houston 1963-2012 We Will Always Love You."

That makes the third high-profile cover of Houston's signature song since the pop diva was found dead in the Beverly Hilton the evening before the Grammys. That very night, LeAnn Rimes sang "I Will Always Love You" at her concert in Reno, Nev.

"I lost it just talking about her and the impact she had on my life before I even began to sing. It made it almost impossible. The tribute to her came from my heart, which was truly broken like the rest if the world," Rimes told E! News.

And Sunday evening, Jennifer Hudson memorably performed the iconic song during the Grammy Awards.

Watch the full Glee performance below:

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