The Keeping Up With The Kardashians star reaches the landmark age of 40 next week – and all signs point to at least a solid weekend of celebrations ahead with lavish outfits galore

Kim Kardashian proudly displayed the string of her underwear as she posed for a sultry set of photograph amid early birthday celebrations.

The Keeping Up With The Kardashians star turns 40-years-old on Tuesday, and it seems the celebrations are well and truly under way with four days to go.

Taking to Instagram on Friday, the mum-of-four posed in a backless black dress designed by Matthew Williams while draping a giant statement handbag over her arm.

The design of the dress included a huge round cut out across the back – with Kim drawing attention to her famous bottom as she wore a bright red G-String that peeped out through the gap in the fabric.