Paris Hilton is none too pleased that DUI-driving actress Mischa Barton has invaded her UK tour with boyfriend Benji Madden’s band Good Charlotte. Mischa, a native of Britain, will join Paris in the gang in the UK in support of her beau Taylor Rocke who plays with LA band Rooney, who is opening for Good Charlotte. The blondes can’t stand the sight of each other and have clashed in what one tabloid calls a “full-on war.”