Jordin Sparks, who starred with Whitney in her final film Sparkle
, sang a tribute to the late singer at the luncheon, performing Look into Your Heart
from the film's original soundtrack. Up until now, Sparks has been mum on the singer's passing, but she broke her silence on the subject today telling ET
's Chris Jacobs that she's been taking the tragic loss of her co-star and friend the only way she knows how; one day at a time.