Larry Birkhead’s former attorney filed a lawsuit against him Tuesday, claiming he didn’t pay his legal bills during a paternity dispute involving his and Anna Nicole Smith’s baby.

Debra Opri wants to force binding arbitration under the terms of a contract in which she agreed to represent Birkhead in September, according to the lawsuit filed in Superior Court.

Opri said her work on Birkhead’s behalf was “extensive, entailed hundreds of hours of work” and required her to travel to multiple states and ...