WHITNEY HOUSTON'S tour woes are continuing down under - with reports of disgruntled fans storming out of her latest gig.

The How Will I Know star's set at Sydney's Acer Arena last night apparently ran smoothly for the first 50 minutes, but then went dramatically downhill after the interval.

Fans walked out before the end, claiming the comeback singer - who spent years battling an addiction to crack cocaine - suffered major problems with her vocals.

Giving it some welly ... Whitney Houston

One told a local paper: "Some of it's been beautiful and some it is just horrible.

"It feels like she's trying to be herself but it's not working."

Another fan - whose son bought her Whitney tickets for Christmas - said: "I have never walked out before a concert finished but that was just terrible.

"I'll be suggesting my son tries to get a refund."

The latest reports follow accusations of a lacklustre performance by the "disorientated" singer in Brisbane, where she coughed throughout the Monday show and took a 20 minute break to catch her breath.

Crowd-members also slammed her voice, with one ticket holder insisting "she didn't sing one song properly".