AP Photo/Kim D. Johnson

They don't mess around with lawsuits in the Rob Lowe household. But is all that efficiency leaving the Brothers & Sisters star and his wife too much time to mess around with the help?

Laura Boyce, a second former nanny once employed and subsequently sued by the actor and his wife, has filed a sexual harassment lawsuit against the couple, the plaintiff's attorney, Gloria Allred, confirms to E! News.

"We filed today an answer and a cross-complaint," Allred said. The lawyer, who also represents Ticked-Off Nanny No. 1, Jessica Gibson, refused to immediately provide a copy of the suit for perusal, but the documents should be coming tomorrow.

No immediate reaction from the Lowe camp on the latest salvo in his Nannygate saga.

Boyce and Gibson are two of three former employees that Lowe sued earlier this month, claiming they had all breached his family's trust and the confidentiality agreements they had signed upon entering his employ, and that his ex-babysitters conspired to extort money from him.

Per Lowe's suit against Boyce, she worked for him and wife Sheryl for about a year and a half, while Gibson was with them on and off for nearly seven years.

—Reporting by Claudia Rosenbaum