Hannah Montana star Miley Cyrus struggles to stay upright in seven inch Louboutins

Teen queen Miley Cyrus needed a helping hand tonight as she struggled to negotiate a flight of of steps in killer seven inch heels.

The 17-year-old singer and actress kept her balance in the peep-toe, Louboutin ankle boots by firstly clinging on to a wall and then by grabing the hand of an assistant who guided her down safely.

Miley, who performed at a music festival in Lisbon, Portugal on Saturday night was at the Villamanga Hotel in the Spanish capital Madrid to launch her new album 'Can't Be Tamed' .

She is hoping sales of the CD will emulate those of her debut album Breakout which hit the top of the charts in the US in its first week of release in 2008. The teenager has come under fire recently for her revealing outfits which have been criticised for being inappropriate for her young age.

On stage at the Rock in Rio festival this weekend she drew gasps from the audience as she strutted in a skimpy green corset.

And the video for the title track of her new album has been condemned for its overtly sexual content.