She may be seven months pregnant and mother to a toddler , but one look at the Duchess of Cambridge 's flawless skin and you would never guess it . So what 's the secret behind the 33-year-old 's pregnancy glow ? An all-natural rosehip oil , apparently . According to US Weekly , Kate has been slathering Trilogy 's Rosehip Oil onto her skin while carrying the second royal baby . Scroll down for video . The Duchess of Cambridge , who is seven months pregnant with her second child , is said to be a fan of Trilogy 's £16.50 rosehip oil . 'Kate is very cautious of products and treatments , ' a source told the magazine . 'Baby 's health comes first . 'Kate continues to use rosehip oil in her daily skincare regiment . She loves the effect is has on her skin . [ Her mother ] Carole [ Middleton ] is also a fan . ' The oil 's description reads : 'Rosehip oil 's potent natural actives make it highly effective for a variety of skin concerns including dehydrated and ageing skin . 'Trilogy ’ s rosehip expertise ensures the finest quality oil with minimum 80 per cent essential fatty acids ( omega 3 and 6 ) and fatty acid ( omega 9 ) content . Independent clinical studies show it helps improve the appearance of scars , stretchmarks , fine lines and wrinkles . ' A source told the magazine : 'Kate continues to use rosehip oil in her daily skincare regiment . She loves the effect is has on her skin . [ Her mother ] Carole [ Middleton ] is also a fan ' Derived from the wild rose bushes that grow high in the Chilean Andes , where the altitude and pollutant-free environment produce the highest quality rosehips , the oil ’ s benefits have been known by the indigenous population for hundreds of years . Not only is it rich in vitamin C and high in omega 3 and 6 fatty acids , known to heal scar tissue , it ’ s also a great source of retinoic acid , which studies show reduces the appearance of wrinkles and brightens skin . As with anything that Kate is reported to be a fan of , the £16.50 oil has already sold out online at Boots.com . It has also been reported that Deborah Mitchell uses Rosehip Oil in her LIA therapy treatment that Kate loves . The Kate effect strikes again ? The oil has already sold out on Boots.com . Models David Gandy , right , and Miranda Kerr have also praised the oil 's skin-boosting properties . It is results like these that prompted Kate Middleton ’ s facialist , Deborah Mitchell , to add rosehip oil to her signature LIA therapy treatment . ‘ Rosehip is perfect for all ages and skin types , including those with sensitive skin conditions like rosacea and acne . I add a drop to moisturiser to boost the results - Kate loves it because it gives skin a luminous glow , ’ Deborah told the Daily Mail back in 2012 . Models David Gandy and Miranda Kerr have also praised the oil . ‘ I put it on at night and I wake up glowing , ’ Miranda has said . The model loves it so much that she even created her own version for her Kora Organics skincare line . A spokesperson for the Duchess of Cambridge declined to comment when contacted by MailOnline . Many brands are using the wonder ingredient in their products . ( L-R ) KORA Organics by Miranda Kerr - Luxurious Rosehip Body Oil , £45 , Pai Rosehip BioRegenerate , £22 , Neal 's Yard Remedies Rehydrating Rose Facial Oil , £20 .
Boots.com reports that Kate , 33 , has been using the product . Oil is rich in vitamin C and high in omega 3 and 6 fatty acids . Miranda Kerr and David Gandy also love the oil .