Lindsay Lohan's Sober Mentor -- 'Inception' Star

1/10/2011 2:38 PM PST

Lindsay Lohan's Sober Mentor -- 'Inception' Star

UPDATE 9:37 PT: Tom's publicist just confirmed with TMZ that Tom and Lindsay do indeed know each other, have been friends in recovery and had dinner together. Although Tom is helping her, the publicist says he is not Lindsay's sponsor.

Someone is trying to plant an idea in Lindsay Lohan's head -- about how to stay sober -- and who better to do that than one of the stars of "Inception," Tom Hardy.

TMZ has learned LiLo has struck a friendship with Hardy recently after the pair were introduced by mutual friends. We're told they even met for dinner one night last week.

Sources tell us Tom is giving Lindsay advice on how to stay sober and Lindsay is seriously listening to him. Hardy famously battled addiction early on in his career and has been sober since 2003.

No word on if a totem is involved.