Gwyneth Paltrow has hailed a $185 "wonder gadget" as the secret of her youthful look.

The 38-year-old actress - who has children Apple, seven, and five-year-old Moses with husband Chris Martin - is a huge fan of the Clarisonic Opal Sonic Infusion, which uses sonic micromassage to deliver an anti-aging sea serum into the upper layers of the skin to plump and hydrate.

She explained: "It focuses on fine lines and wrinkles around the eyes by infusing the skin with anti-aging serum."

The 'Iron Man' star is also a fan of the company's Clarisonic Mia gadget, which costs $149 and claims to "improve skin tone, reduces the appearance of pore size and helps skin care products work their best."

Writing in her GOOP! Newsletter, Gwyneth said: "I've been obsessed with mine ever since I started using it. I've seen a real difference I my skin."

The blonde beauty also used her newsletter to reveal her favourite bargain summer beauty products, which included Vapour Organic Beauty Luminous Foundation, $34, Supergoop sunscreen, $8.50-$34, Sara Happ Pink Grapefruit Lip Scrub, $24, Kai Body Butter, $55, and $32 La Licious body scrubs.