Brandy Norwood and Serena Williams

Let the Drop Dead Diva custody battle begin.

After Elisa (Brandy Norwood) hires high-profile, hard-ass attorney Kelly Stevens (guest star Serena Williams) to fight for sole custody of Eric, Parker (Josh Stamberg) will enlist Kim (Kate Levering) to help to prove he's a great father. Unfortunately, that won't be so easy. In this exclusive first look at this Sunday's episode, Parker will learn the hard way that custody battles can get ugly.

Could wedding bells be ringing on Drop Dead Diva?

"I've been following Serena's success at Wimbledon and I'm so happy for her," Levering says of working with the tennis pro. "She seems to take the same approach on set as she does on the court. She was just completely prepared and focused. She nailed it! And on top of that, she was very sweet, and everyone really loved working with her."

Drop Dead Diva airs Sundays at 9/8c on Lifetime.