X17 reports that Britney Spears and her assistant went to estranged husband Kevin Federline’s San Fernando Valley house, buzzed the intercom, and got no answer. The singer then went around the block, came back, rang again, no answer. After a third attempt with no reply, Spears then took her anger out on the paparazzi, grabbing an umbrella and hitting their car, yelling. The video and pictures have yet to be posted. Read more.