Atherton has taken residence in the number 5 Pollen Street site, directly opposite his famous eatery, for the Parisian style bistro which will open on 18 March.
Little Social will offer a fixed-price menu at lunch and an a la carte dinner offering. Dishes, priced around £22-30, will include pork chop with butternut squash puree, pine nut & pecorino and endive as well as roasted gurnard, saffron mash, fennel and Cornish soup.
Atherton is also opening another London restaurant - Social Eating House - this spring. The bar and restaurant, in partnership with Pollen Street Social chef Paul Hood, will open on 18 April.
The reservation line for Little Social opened on 8 March.