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How could they have known?
Houston appeared lively—if borderline manic—offering the trio hugs and kisses as she bid farewell from the Grammy rehearsals on Thursday, even urging her 19-year-old daughter, Bobbi Kristina Brown, to give her "godfather" Davis a hug.
Davis embraced Houston and sent her off with what in retrospect is an sadly eerie comment, characterizing the moment as "a day of tribute."
Later that night, Houston joined Kelly Price onstage for the latter's unplugged concert in L.A. (The Grammy-nominated Price was a featured artist along with Faith Evans on Houston's "Heartbreak Hotel" from 1998's My Love Is Your Love.)
The two dueted on what would be Houston's finale performance, a version of "Yes, Jesus Loves Me," which was captured on cell phone video and has made its way online.
"Whitney was happy, doing what she loved, with her friends and completely joyful," Price's rep tells E! News. "It was beautiful."