Schwartz famously cast Bilson as Summer Roberts in The O.C. and later reunited with the actress on Chuck.
Bilson said that she considers Schwartz to be like family, especially after introducing the writer to his wife Jill Stonerock.
She told The AP: "We do work really well together and he's so talented and I trust him more than anything. Before I take a new project I usually call Josh and I'll be like, 'What do you think?'
"It's really nice to feel that comfortable jumping into something new having him by my side."
Bilson also revealed that spending four seasons on The O.C. helped prepare her for Hart of Dixie.
"The O.C. - I started when I was 21. Now being 30 years old and working on a show it's just different... you know the drill and it's kind of nice to step into a role and a job that you're very familiar with," she said.
Hart of Dixie continues with new episode 'In Havoc & In Heat' on Monday on The CW.
> Hart of Dixie star Rachel Bilson launching shoe shopping website
> Hart of Dixie star Jaime King teases love triangle