Will.i.am is suing Pharrell Williams over his use of "I am."
According to Billboard, court documents obtained by Rolling Stone detail Will's concerns that Pharrell's logo for his "i am OTHER" brand closely resembles will.i.am's logo for the trademarked "I am." He also says that he owns the copyright to the phrase 'I am" as well. 
According to the document, Will believes, "The registration of the mark ... is likely to dilute the I AM mark and the WILL.I.AM mark."
In a statement to Rolling Stone, Pharrell expressed he is "disappointed" in the lawsuit.
"I am someone who likes to talk things out and, in fact, I attempted to do just that on many occasions," he said. 
"I am surprised in how this is being handled and I am confident that Will’s trademark claims will ultimately be found to be as meritless and ridiculous as I do.”
Will.i.am just released his first solo album in April. Pharrell has most recently seen musical success with his appearance on Robin Thicke's chart-topping hit "Blurred Lines."