Christina Aguilera's whole dazzling raison d'etre - and the key to trouncing her former Mouseketeer peers (especially bleating Britney Spears) - is that she doesn't do things by halves.

Why flirt with suggestion when she could cavort in leather chaps (filmed by chichi photographer David LaChapelle) while singing a pop classic called Dirrty?

And why release a jazz-inflected album when it could be a brassy, double-pack glamorama - this summer's entertaining, if incredibly self-celebratory, chart-topper Back To Basics.

So, Christina's Back To Basics tour stands to be totally OTT. Pricey tickets for this London two-nighter presumably pay towards its hydraulic stage effects, with choreography by Jamie King (who created moves for her 2003 Stripped tour) and costumes by Roberto Cavalli (whose fondness for pompoms should alert the fashion police).

Even when the show gets schmaltzy (there's a big screen montage of fans' testimonials), it's sassed up with inimitable flair. She might no longer be known as 'Xtina' but, as she croons on album track Still Dirrty: 'I still got the nasty in me/Still got that dirrty degree.' Ain't no other (wo)man? Ain't that so.

Tonight and tomorrow, Wembley Arena, Empire Way HA9, 7pm, £40 to £90 (limited availability). Tel: 0870 060 0870. www.livenation.co.uk/wembley Tube: Wembley Park