David Beckham's sister Joanne Beckham shows off her two up front during birthday bash

London: Joanne Beckham clearly hasn't picked up any subtle style tips from sister-in-law Posh. David's little sister hit the town to celebrate her 31st birthday last night - showing off acres of flesh in a gaping little black dress.

Hairdresser Jo shed three stone last year, and she was desperate to flaunt her new figure as she partied with friends at London hotspot DSTRKT.

But she almost ended up in her birthday suit as she climbed into a cab at the end of the night - coming within millimetres of a nip slip as the top of the her frock fell open and her breasts almost tumbled out.

To make matters worse, she had to battle to stop the bottom of her dress from riding up and revealing her knickers.

Jo's superstar sibling and his ex-Spice Girl spouse were notably absent from the unstarry celebrations.

Earlier on Tuesday she joined the more famous half of the family as they celebrated Cruz's eighth birthday at a special cinema screening in Notting Hill.

Maybe she should have taken them aside for some fashion advice, while she had the chance.