Sparks - who co-stars with Houston in Sparkle - reflected on the 'I Have Nothing' singer's tragic death prior to attending the 5th Annual ESSENCE Black Women In Hollywood Luncheon.
"She was an incredible woman and I was very, very blessed to get to know her for the short time that I did, but she was incredible," the singer told Access Hollywood.
Sparks went on to predict that audiences will love the upcoming musical film Sparkle, which will mark Houston's final screen role.
"It gives me a lot of excitement to be able to put this movie out because it was [Whitney's] baby, and she was so, so into it and so happy to be doing it," she explained.
Sparks added: "I'm excited that I get to be a part of it."
The singer paid tribute to Houston at the 5th Annual ESSENCE Black Women In Hollywood Luncheon on Thursday by performing a song from Sparkle.
Sparkle is released on August 17 in the US and October 5 in the UK.
Houston's life was honoured at last Saturday's funeral at the New Hope Baptist Church in Newark, NJ. Sparks, Mariah Carey, Kevin Costner and Alicia Keys were among those in attendance at the service.
More Whitney Houston Coverage:
> Whitney Houston 1963-2012: Reactions
> Whitney Houston 1963-2012: Obituary
> Whitney Houston: A life in pictures
> Whitney Houston: Greatest musical achievements - pictures
> What is Whitney Houston's best song? Poll
> Clive Davis dedicates pre-Grammy party to Whitney Houston
> Whitney Houston to dominate singles, album charts next week
> Bobby Brown: "I love you, Whitney"
Watch Whitney Houston perform 'I Believe In You and Me' and 'I Will Always Love You' in 2004 below: