Why did Kanye West lose his cool?

London: Rapper-cum-fashion designer Kanye West threw a fit of rage when asked about his girlfriend Kim Kardashain`s ex-boyfriend.

Kim and Kanye went for a dinner at an upscale steak house, Prime 112, in Miami Sunday night where the realty TV star`s ex boyfriend Reggie Bush was also present.

The 35-year-old got angry when a camerawoman outside the eatery asked the singer if he congratulated Bush, who is about to become a father for the first time.

Clenching his teeth, Kanye walked right up to the woman and grabbed her camera, reports a website.

Meanwhile, Kim, who dated Reggie on and off for two years, was seen trying to calm Kanye down.