​Don't dis Donald Trump. Rihanna is learning that lesson the hard way after being slammed by the ticked-off tycoon for her disrespectful disappearing act Saturday night at his private club on Palm Beach Island.

before she was set to perform for the Dana-Faber Cancer Institute's 20th Annual Discovery Celebration event at Trump's Mar-A-Lago Club.

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But that didn't stop a healthy-looking Rihanna from getting on stage the very next night, where she performed alongside Drake and Kanye West at the 2011 NBA All-Star Games in Los Angeles.

According to Molly McHale, a media spokesperson for the Dana-Faber Cancer Institute, Rihanna -- who committed to perform back in October -- informed the event chairperson she would not be making it just 24 hours before she was set to be in Palm Beach for the charity event. 

"Her doctors told Paul [Fireman] she was still sick from the bronchitis she had during the Grammys and wasn't feeling well. By late evening on Friday [February 18], she had canceled," said McHale.

Fireman scrambled to find a replacement Friday night, deciding on former American Idol finalist Jennifer Hudson, who flew in the next day and was ready to perform Saturday evening for the event. 

"She was great, a lot of fun," said McHale. "She's a wonderful singer, and we were glad to have her."

For more information on how you can contribute to upcoming charity events, visit the "How to Help" section of the Dana-Faber Website.

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