J.Lo and behold, Jennifer Lopez (search) yesterday fired a new salvo in her bitter battle with former manager Benny Medina.

The 32-year-old superstar singer and screen siren filed a petition against Medina, accusing him of diverting and misappropriating monies belonging to her.

The sultry star also charged that Medina -- largely responsible for molding the Bronx-born beauty into a megastar -- went behind her back and bagged an inappropriate "consulting fee" of more than $100,000 on a project of hers.

J.Lo also accused Medina -- said to have reaped up to 20 percent of the star's income - of preventing other representatives from speaking with her. Medina, of Handprint Entertainment, acted "in a manner detrimental to the best interests of [Lopez] and in a manner which adversely affected [Lopez's] business, personal and financial interests," according to court papers.

The Wedding Planner sexpot also accused the 43-year-old Hollywood manager of "performing unlawful activities" without a talent license in California.

The petition, with the Division of Labor Standards Enforcement, was filed in Los Angeles Superior Court.

"Jennifer's doing this as the last resort because she feels wronged, taken advantage of and misled," said her lawyer, Barry Hirsh.

Insiders speculate Lopez will end up giving Medina, her manager of five years, $25 million to buy him out.

Medina was unceremoniously dumped by his star client last month, a day after she canned her Hollywood talent agency, Endeavor, and two weeks after she fired her publicist, Alan Nierob.

Medina is being blamed for encouraging J.Lo's outrageous diva demands, including her insistence on white lilies, white candles and room-temperature Evian wherever she travels.

The sultry singer-actress, engaged to hunky actor Ben Affleck (search), has since signed with Creative Artists Agency (search).

Medina responded to J.Lo's petition, saying "It's unfortunate that [she's] using a Labor Commission lawsuit as a means of mitigating her outstanding financial contractual obligations to my company and me.

"The accusation that I misappropriated money from Jennifer Lopez is both untrue and offensive," Medina said in a statement.