Mel Gibson lost temper at tree-planting

Mel Gibson and Oksana Grigorieva's relationship allegedly imploded during a tree-planting ceremony for their young daughter.

Tensions between the couple reportedly reached their conclusion on February 18, when the pair invited close friends and family members to their mansion in Malibu, California, to celebrate the arrival of baby Lucia - then aged three months - by planting a tree in her honour.

However, a source told RadarOnline.com the 'Braveheart' actor lost his temper during the day, and accused the Russian singer of "smiling too much" while talking to one of the male gardeners.

Just hours later, at approximately 6pm, Oksana took baby Lucia and left the lavish home and moved to one of Mel's other homes in Sherman Oaks, Los Angeles.

Mel - who has been accused of domestic violence against Oksana - faces a criminal investigation on domestic battery charges by the Los Angeles County Sheriff's Department and is part of a Department of Children and Family Services investigation, which is looking into claims Mel left Lucia bruised and hit Oksana while she was holding her.

Before Oksana left Mel in February, it has been claimed he pulled a gun on her and threatened to shoot her, their daughter and her 12-year-old son Alexander, before turning the weapon on himself.

Alexander - who is the son of former James Bond star Timothy Dalton - was interviewed by child protection services earlier this month about the January 6 incident.

Mel, 54, has now arranged for an independent observer to be present whenever he visits his daughter, to stop Oksana from making any further accusations against him and to speed up the ongoing child protection investigation.