Justin Theroux is reportedly trying to turn Jennifer Aniston into a ''businesswoman''.

The 42-year-old actor is keen to ''double'' his fiancée's fortune and help her deal with her accounts, so that she can maximise her wealth.

A source told RadarOnline: ''Justin knows exactly how much money Jennifer has right now, and he's actively trying to help her double it, and turn her into a shrewder businesswoman.''

The couple are reportedly working together on projects in order to make more money between them for their future.

The source explained: ''Justin is regularly pitching ideas for how Jen can expand her business empire.

''They're working on projects that they can collaborate on and which can make them both a lot of money.''

Meanwhile, the pair - who got engaged in 2012 - sparked rumours last year their relationship was on the rocks after they spent a lot of time apart due to their respective filming commitments.

However, they managed to get their romance back on track over the festive period after they took a vacation to Cabo San Lucas in Mexico to sort through their differences.

The duo are now said to be busy planning their wedding after deciding to tie the knot in Hawaii.