Inception star Riley, 30, and the PayPal and Tesla Motors founder, 44, ended their first marriage in 2012 after only 18 months as husband and wife, but they reconciled and tied the knot again in July, 2013.

Musk filed for divorce for the second time on New Year's Eve in 2014, but they both moved to have the motion dismissed last August (15).

However, their reunion was shortlived as Riley lodged new papers in Los Angeles Superior Court on Monday (21Mar16) to end their second marriage once and for all.

According to TMZ.com, the estranged couple has been living separately for the past six months.

The pair has no children together, although Musk shares five sons with his first wife, author Justine Wilson.