P. Diddy reportedly banned his girlfriend Cassie from attending his New Year's party last weekend at the request of his baby momma Kim Porter.

Sources say that 'King Of Hearts' singer Cassie had spent the last two months planning the party which she believed she would co-host alongside Diddy at his mansion in Florida. However, when mother of several of his children, Kim, decided last minute that she would attend, Diddy uninvited Cassie from the lavish party.

"Cassie helped put together everything, it was supposed to be a party hosted by her and [Diddy]. But Kim [Porter] told [Diddy] that she wanted to attend, and that f*cked up everything," a source told MediaTakeOut.

The insider added: "Cassie was upset, but she did as [Diddy] asked, and stayed home . . . But security was on alert, not to let her onto the premises."

It seems Kim is not the only competition Cassie has to worry about - Diddy has been linked to Hollywood actress Cameron Diaz in recent months after a series of sightings.

Was Diddy wrong to uninvite Cassie to the party she helped plan?