Pregnant pop star Britney Spears reportedly gave her sister's TV co-star a "sisterly talking to" and did not yell at her for being mean to Jamie Lynn.

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The New York Post had quoted a source saying Alex Nikolas, 13 -- co-star of Nickelodeon's "Zoey 101" with Jamie Lynn Spears -- was in tears after the elder Spears called her "an evil little girl" and told her to watch herself or she would "never work in this town again."

But a spokeswoman for Spears said she was merely protecting her little sister amid reports of tensions on the set, the World Entertainment News Network said Tuesday.

"Jamie Lynn and another girl on set were having problems, as 13-year-olds do," the spokeswoman said. "Britney did have words with the girl, but felt she was sticking up for her sister. She did not yell by any means, she just gave the girl a sisterly talking to and wondered why they just couldn't all get along."