When Jay-Z dropped D.O.A., T-Pain first said he was cool with the track and that it inspired him. Now things have changed and the autotune king was spotted saying "F*ck Jay-Z" during a party in La Vegas.

While DJ’ing at the Hard Rock’s pool in Las Vegas, otherwise known as Rehab, T-Pain dissed Jay-Z : "F**k Jay-Z" & "Jay-Z sucks!", he also took some time to add "I think if anything is dead, it should be him".

Rapper Fabolous, who was in attendance alongside Rihanna, tweeted about it, saying he wasn’t feeling it :

"Yo I’m at Rehab in Vegas ... T-Pain is DJ’ing ... sayin f*** Jay-Z, he old blah, blah ... guess it’s backlash from ’D.O.A.,’ ".

"So I’m here with Rihanna ... Drinkin’ son, strawberry/daiquiri ... Not feeling the T-Pain Jay-Z dissing ... Brooklyn," he continued.

Despite T-Pain dissing Jay-Z throughout his set, the following DJ decided to give Pain a dose of Hov.

According to Fab, he immediately played D.O.A., "Heart of the City," and "H To The Izzo."

Back in June, T-Pain joined Jay-Z onstage for a performance of "D.O.A." at Hot 97’s annual Summer Jam concert in New York, to show the pair were still cool.

What’s funny is that in related news, T-Pain just launched his own Autotune iPhone app called I Am T-Pain:

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