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Cover your ears, Ray J!

While performing his song "Bound 2" for the first time on Late Night With Jimmy Fallon last night, Kanye West took a jab at Kim Kardashian's ex-lover, who's also the younger brother of singer Brandy. So how bad was the diss?

After taking the stage with singer Charlie Wilson, Kanye began rapping with the lyrics, "Brandy's little sister lame, man, he know it now/When a real brother hold you down you supposed to drown."

"Brandy's little sister"? Ouch.

LATE NIGHT WITH JIMMY FALLON, Kanye West

Lloyd Bishop/NBC

Kim and Ray J's relationship dates back to the early 2000s, long before the new mom and current beau Kanye began dating last year.

Meanwhile, Kanye announced last week that that he is embarking on a 23-city, 7-week North American tour for his latest album Yeezus, which will kick off on Saturday, Oct. 19, in Seattle. Kanye's opening act will be Kendrick Lamar.

Tickets will go on sale on Friday, Sept. 13.

Somehow, we don't think Ray J will be catching his Oct. 26 show in L.A.