As we first reported, Susan was set to sing "Hallelujah" on the show tomorrow. But a rep for the show confirmed to TMZ she won't be appearing this week -- no word yet on rescheduling.
A source tells us Susan missed a flight to L.A. today. She was supposed to tape her performance on the "DWTS" set this evening.
We're told host Tom Bergeron will address the issue on tonight's show.
UPDATE: A rep for Boyle tells TMZ, "Susan Boyle has had to cancel her performance on 'Dancing with the Stars' as her doctor advised her not to sing due to a severe throat infection. Susan is very upset at letting her fans down. Their continued support means so much to her."
