The 47-year-old singer - who has a history of substance abuse issues - was reportedly told not to attend anymore of the pop legend`s shows after she appeared "intoxicated" at every concert she went to in the run-up to her entering a treatment facility to seek help for her addictions.

According to gossip website TMZ, organisers eventually grew tired with Whitney`s demands after she pestered them for free tickets and then demanded to be let up on stage with the `Purple Rain` singer.

An insider revealed: "They didn`t want her to embarrass herself."

After eventually being banned from the gigs due to her increasingly "erratic behaviour", Whitney voluntarily entered an out-patient rehab program around 10 days ago.

Her spokesperson recently confirmed: "Whitney Houston is currently in an out-patient rehab programme for drug and alcohol treatment.

"Whitney voluntarily entered the programme to support her long-standing recovery process."

The treatment programme reportedly allows the singer - who was pictured at a Prince concert last weekend - to leave the facility, as long as she is accompanied by a monitor.
sections: Celebrities