Angelina Jolie and Brad throw go-karting birthday party for Maddox

According to US reports, Angelina Jolie and Brad Pitt celebrate their son, Maddox's birthday by giving a go-karting birthday party.

This is his ninth birthday. The birthday party was held at Go Kart World according to RadarOnline.com.

A source told the US website: 'They stayed for about two hours. Brad and Angie were very nice people and only asked other people there not [to] take pictures.'

Source