Fisticuffs: James Packer.

In March, James Packer and two other backers have reportedly topped up their initial $US60 million investment last year with up to another $US100 million. Photo: Bohdan Warchomij

James Packer's bruising week is ending on a brighter note with the billionaire facing a big pay day thanks to Apple.

The US computing giant is in talks to acquire rapper Dr Dre's music subscription service Beats Music for $US3.2 billion ($3.4 billion) which includes Mr Packer as an investor.

In March, Packer and two other backers have reportedly topped up their initial $US60 million ($66 million) investment last year with up to another $US100 million.

Mr Packer has also scored big wins on the Hollywood front with his movie producing venture RatPac.

Its joint venture with Warner Bros helped fund the critically acclaimed hit Gravity, as well as The Lego Movie, which notched up the second-biggest February opening weekend in the US with a $US77.2 million ($86 million) gross.

Mr Packer still has a legal cloud over him following a public brawl last Sunday with former best mate and Nine chief excutive, David Gyngell. 

The fight is currently the subject of a police investigation.

In an interview with US business magazine Forbes in March Mr Packer (pictured) said he had made "a bunch of mistakes in my life".

"Business is good right now, but now my personal life is a disaster," he told the magazine.

"I had a marriage breakdown last year. The last thing I think I am is perfect. I'm just trying to do the best job I can. I'm trying to be the best father I can to my kids. I'm trying to do the best job I can running my business."