A lustrous and ever-youthful glow is the golden standard of the beauty industry. But in a world saturated by late nights and early morning lattes, having great skin is easier said than done. With hi-res photography picking up even the tiniest lines and wrinkles, some of celebrity's most photographed faces have a quick fix or two in their back pockets when it comes to conjuring up a radiant sheen.

Here we take a look at skincare tips and tricks from modern beauty icons, from Princess Diana to Lupita Nyong'o. Whether it's the moisturising face scrub Beyonce swears by, Victoria Beckham's "ambulance in a tub" or Scarlet Johansson's obsession with apple cider vinegar, come see the skincare secrets the stars have to share:

Photos: Rex Features