Juan Gabriel Hospitalized -- Mexican Singer Rushed To Las Vegas ICU

Mexican music icon Juan Gabriel was rushed to a Vegas ICU Monday morning -- where he was diagnosed with a bad case of pneumonia.

According to his rep, the 64-year-old had woken up with an intense fever and congestion.

Gabriel -- one of the best-selling Latin recording artists of all time -- had performed a 3-hour set just the night before at Mandalay Bay resort. According to his rep, the pneumonia has forced the singer to postpone 3 shows in California this week.