Tito Jackson attends the premiere of "Michael Jackson: The Life of an Icon" at the Empire Cinema in Leicester Square. (Nov. 2, 2011)

*Tito Jackson says he was inspired to finally pop the question to his longtime girlfriend Sonia Galindo after attending the London premiere of the documentary “Michael Jackson: The Life Of An Icon” earlier this month.

The film focuses on the King of Pop’s  life from his beginnings with the Jackson 5 through his death in June 2009. Tito, 58, said seeing his brother’s tragic end on the big screen inspired him to make the spontaneous proposal.

A source told BANG Showbiz: “When Tito watched the film and saw him and his brothers performing together as the Jackson 5 and then saw how Michael’s life ended so suddenly he realized how fleeting life really is. Afterwards he called Sonia and asked her to marry him. They have never been happier.”

The musician has been dating the fitness and beauty expert for several years and will honeymoon in the UK where his best friend of more than four decades, David Gest, will personally fly over 150 guests from the US on a private plane for a party in the couple’s honor.

The event has already booked “one of the world’s greatest female vocalists of all-time to perform at the party as well as five legendary Motown acts who were Tito’s musical influences,” reports BANG showbiz. The identity of the artists were not given.

The party will take place at a castle in Yorkshire where all the revelers will stay for the weekend.

This will be Jackson’s second marriage. His first produced three sons: Taj, Tarryl & Tito Joe, who formed 90s pop group 3T.

Promoter-and-producer Gest is extremely proud that his film – which BANG Showbiz described as one of the most insightful and brilliant documentaries produced on Michael and contains interviews with over 50 of Michael’s friends and family, including Whitney Houston, Smokey Robinson and the last interview conducted by his late manager Frank DiLio – inspired Tito to pop the question and he can’t wait for the wedding.

He said: “Tito, along with his late brother Michael, has been my closest friend since childhood and I can’t wait to celebrate his and Sonia’s happy news. I can’t believe that my film was responsible for their engagement. The documentary was a labour of love for me and it’s wonderful that it has strengthened the love of these two people.”

“Michael Jackson: The Life of an Icon” has just been released worldwide on DVD and Blu Ray by Universal Pictures.