{blackbabes} Aretha Franklin Won't Perform at Whitney Houston Funeral: Report

Just hours after Aretha Franklin brought fans to their feet at her New York City concert Friday night, her planned performance at Whitney Houston's Saturday funeral was cancelled.

Although Franklin, 69, was expected to pay tribute to the late singer – who died last week at 48 – with her rendition of "The Greatest Love Of All," a rep says she is ill and cannot perform, reports CNN.

On Friday night, the singer put on a powerful show at Radio City Music Hall with old favorites, new songs, and a tribute to her late goddaughter.

"I would like to acknowledge the passing of one of the greatest singers that ever stood behind a microphone," Franklin told the star-studded crowd (Clive Davis, L.A. Reid and Jesse Jackson were in attendance).

"She's moved on up just a little bit higher now. And we don't wonder where she is. One of the last songs she sung is 'Jesus Loves Me.' When God is for you, who can be against you? That's all that matters."

In an exclusive tribute written for PEOPLE, Franklin called Houston "a true superstar."

"Remember the hits. Forget the misses," Franklin wrote. "Let us all applaud and remember Whitney for the beautiful, giving and caring young lady and the talented artist she was."

Still commemorating Houston through music at Saturday's New Hope Baptist Chuck ceremony in Newark, N.J. : Stevie Wonder, who's expected to sing his hit "Ribbon in the Sky," R. Kelly and Alicia Keys.

The Associated Press will stream Whitney Houston's private funeral service Saturday at noon ET on its Livestream site, which will be available on PEOPLE.com.