The agency has been tasked with developing advertising alongside digital and social content, as part of an overall growth strategy for the company. New work will launch later this month and will run until January 2015.
The e-commerce company sells beauty products from more than 550 major brands and operates across Europe.
In 2013, Feelunique.com worked with Leagas Delaney, producing TV, print, digital, social and experiential campaign under the strapline, "It’s all about me". Leagas Delaney no longer works with the brand.
Stephen Maher, the chief executive of MBA and chairman of the Marketing Society, said: "Feelunique.com is quite simply a unique destination for the beauty consumer, so this was a great opportunity to use digital, social and direct channels to drive footfall.
"Watch out – Feelunique.com might be the next Asos of the beauty market."