Music
Rex Features
The former member of Destiny's Child is currently undertaking a six-week stint as Chicago's Roxie Hart in London's West End.
She told the BBC: "Because I'm not visible over here with the number ones, they think I'm not doing anything or they think I'm not as successful.
"But I'm in the freaking West End! I'm the first African-American woman to play this role in the West End!"
She added: "I wanna be respected for what I do but I don't wanna be bombarded and can't go anywhere.
"So that's what I have over Beyoncé. I can go anywhere I want."
Williams will be performing in the musical at the Cambridge Theatre between July 13 and August 22.
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