<p>Supermodel Eva Herzigova has warned Cara Delevingne not to use social media sites such as Twitter and Instagram.</p><p>'I don't think models and people in the public eye should be publicising their private lives,' Eva who has posed nude for the Pirelli calendar told me at the Claridge's Christmas tree unveiling last week.</p><p>'One day when the younger models such as Cara are older, they'll look back and regret the silly or embarrassing pictures they made public,' the 40-year-old Czech-born beauty added.</p><p>Eva Herzigova (left) had some social media advice for younger models like Cara Delevigne (right)</p><p><a href="http://www.dailymail.co.uk/tvshowbiz/article-2516237/MOS-DIARY-Dont-Twitter-twit-Eva-Herzigova-tells-Cara-Delevingne.html">Keep reading...</a></p>