Her co-star Chris Colfer (Kurt Hummel) also praised Riley's rendition on the social networking site, telling her: "'I Will Always Love You,' best part of my life. Ms. Houston is bragging about you in heaven."
Speaking about her adoration for Houston at this weekend's Grammy Awards, Riley explained: "Whitney's music meant so very much to me. I was very very choked-up when I heard about her passing.
"I'd grown up listening to her voice ringing out throughout our household. I'm so speechless, I can't believe that she passed."