Hilton reported Thursday on his website that Zajicek had quit working for Griffin, adding that an insider told him the split was "not pretty" and occurred earlier this month.
"Jessica had just had enough of Kathy," the insider told Hilton. "She put up with her for several years. She couldn't take it anymore."
Zajicek has appeared on My Life on the D-List since the Bravo reality series first premiered in August 2005. Fourth-season episodes currently air Thursdays at 10PM ET/PT on Bravo.
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