Actress Lindsay Lohan was questioned by police on Monday to help with an investigation into an alleged theft at a house party. Lohan slept over at that home on Sunday night after a small get together along with several guests. When everyone woke up in the morning, the owner of the home claimed expensive jewellery had been stolen from the property, reports tmz.com. Police were called to the home and interviewed everyone inside, including Lohan. Accrording to a source, Lohan was very cooperative, but claimed she had nothing to do with any missing jewellery. Lohan is not considered a suspect at the moment. The investigation is ongoing.