Beyonce Sues Over 'Feyonce' Merchadise

Beyonce doesn't give an 'F' -- she doesn't want anyone thinking she has a thing to do with the merch that's being hawked by feyonceshop.com ... so she's suing.

Bey's going after the site, demanding it cease and desist from selling all merchandise with the "Feyonce" mark. It's already on t-shirts, sweatshirts, mugs and much more. She says the site's even using the same font as her self-titled album.

According to the docs, Queen Bey thinks it's too close to a play on her name and the word fiancee. She's really irked because one of the mugs says, "He put a ring on it" -- a reference to a "Single Ladies" lyric.

Beyonce says the people behind the online store are even trying to trademark Feyonce ... which confuses the marketplace and damages her brand.