SAN FRANCISCO — Farella Braun + Martel has sued a Bay Area socialite and skin-care entrepreneur over what it contends are attempts to “cheat” the firm out of more than $450,000 in fees that she began racking up during a 2011 legal spat with her ex-boyfriend.

It’s the second time that the firm has gone after Elisabeth Thieriot, founder of a botanical skin care line and author of the book, “Be Fabulous at Any Age.” The firm previously sued Thieriot in January 2016 to confirm an arbitration award for $467,227.81 over the unpaid legal bills, and won.