Britney Spears is set to be joined by her two sons in Australia - as she faces harsh criticism from her fans for lip synching parts of her show.

Spears has been engulfed in a controversy over her lip-synched performances that has left her ‘extremely upset’ according to her tour promoter.

Fans were reportedly storming out of her concert after just a couple of tracks in Perth but her promoter ardently denied the report.

Meanwhile, local politicians were up in arms over the false advertisement of concerts such as Spears’ and are now calling for ticket disclaimers for any artists who lip synch.

Amid all the controversy, Spears is set to be reunited with her two sons, who have reportedly been flown into Australia with ex-husband Kevin Federline.

Federline arrived in Melbourne with Sean Preston, four, and Jayden, three, ready to meet Britney who is flying across the country from Perth.