Jason TrawickJason Trawick - the third Mr Spears?Could it be a case of third time lucky for Britney Spears?

Her agent/boyfriend Jason Trawick certainly seems to tick all the potential husband boxes.

We were particularly touched by this latest snap of the strapping blonde carrying Britney's sleeping younger child, Jayden Jameson, on his shoulder as the couple headed to her concert in Melbourne.

Is that devotion or what?

Jason's been dating 27-year-old Britney since June this yBritney SpearsBritney Spears in Ozear, but unlike her failed marriage to former husband Kevin Federline and annulled wedding with childhood friend Jason Alexander, their relationship together has been remarkably low-profile.

To all intents and purposes, he appears to be a calm, steadying influence on the star, who has gone from strength to strength following her highly publicised breakdown at the beginning of last year.

Indeed, one source close to the duo branded Jason "the best thing that happened" to Britney, when she began seeing him this summer.

Check out the latest snap of Jason, along with other MEN IN BRITNEY'S LIFE OVER TIME.