Lady Gaga's A.C. concert and benefit appearance are off

Lady Gaga won't be in Atlantic City Saturday night.

Her show at the Borgata in Atlantic City is off and she won't host a benefit after she got sick just before her show last night in West Lafayette, Ind.

The Borgata says her doc diagnosed her with dehydration and exhaustion and urged her to rest. The Borgata date was one of three canceled shows. (Borgata will give refunds; questions: 1-866-900-4TIX.)

The “Hands Up for Marriage Equality” at Club Worship in the House of Blues at Showboat is supposed to go on as scheduled, but a rep said Gaga's appearance would be rescheduled.