Pop star Taylor Swift is being sued by an apparel company claiming part of her own clothing line infringes on its trademark.

E! News reports that the Orange County, California-based Lucky 13 filed a federal lawsuit Tuesday against Swift, 24, who has marketed products bearing the phrase "Lucky 13" or the number "13," saying it confuses the marketplace.

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The "Red" singer has spoken about the significance of the number in her life, telling MTV in 2009, "Basically whenever a 13 comes up in my life, it's a good thing."

According to TMZ.com, company owner Robert Kloetzly wants Taylor's online store site shut down, in addition to monetary damages.

As of Tuesday afternoon, no apparel with "Lucky 13" appeared on Swift's merchandise site, where the only products bearing the number 13 were earrings and a necklace with "1" and "3" displayed separately.

Swift's representative did not respond to a Newsday request for comment.