LONDON, Dec 21 (Reuters) - French fine jeweller Messika, whose designs have adorned the likes of singers Beyonce and Rihanna, is looking for a new financial backer to take a minority stake and help grow the business, three people familiar with the matter told Reuters.

The Paris-based group is working with investment bank JPMorgan on the stake sale of the business, the people said. The deal could value the family-owned business as high as 1 billion euros ($1.10 billion), one of the people said.

The sources, who requested anonymity because the matter is confidential, said deliberations are ongoing but cautioned no deal is guaranteed.

Spokespeople for Messika and JPMorgan declined to comment. ($1 = 0.9099 euros) (Reporting by Andres Gonzalez and Amy-Jo Crowley. Editing by Anousha Sakoui.)