: Two BLACK INK got into a HUGE – inside Diddy’s $40M Star Island .

Diddy opened up his to celebrity friends – to ring in the new year in style. And well, that was a mistake.

In addition to celebrities – a lot of REALITY STAR RATCHETS were at the event – and it POPPED OFF.

According to MediaTakeOut.com’s snitches, Rah Ali and Sky from BLACK INK got into a fight – and Rah Ali beat Sky BLOODY.

An insider explained, “They broke up sh*t all in Diddy’s house, got blood on stuff. It was real messed up. In a house like [Diddy’] they probably did $ in .”

No word yet from Diddy about the F*CKERY that went down last night . . .