Lindsay Lohan's younger brother Michael Lohan Jr was married over the weekend, but the actress wasn't able to attend the celebrations as she is busy "working on a top secret project".

While the "Mean Girls" star, who has kept silent on social media for the past week, was missing from the ceremony, her divorced parents Michael and Dina both attended the nuptials. 

Lindsay has been spending a lot of time abroad lately. She also jetted off to Greece last month. She has been working with refugees. 

It is said that the 31-year-old skipped her brother's wedding as she is busy working on a top secret project, reports aceshowbiz.com.

In a statement, Lindsay's spokesperson said: "Her brother knew she would not be there they spoke before it happened and she wished him well."