New York, June 25 : Lindsay Lohan has already started chalking out plans for a party after she completes her house arrest. Lohan, 24, will reportedly complete her sentence on Wednesday and is due to celebrate her 25th birthday at Paul Sevigny and Andre Saraiva's joint 40th-birthday party at Stadium Red Estate in the Hamptons on July 2.But that could be thwarted if the LA district attorney and