Brad Pitt spends quality time with son Knox at racing event in the UK

<!-- rectangle --> His motoring documentary, Hitting The Apex, will be released in cinemas in a matter of days. And Brad Pitt reiterated his love of racing as he attended the MotoGP British Grand Prix race at Silverstone in Northamptonshire, England, on Sunday, where he was joined by his young son, Knox.  The 51-year-old star looked every inch the doting father as he and his