Levi Johnston to pose for 'Playgirl'

The father of Sarah Palin's grandson has agreed to pose for online magazine Playgirl, according to his attorney.

Levi Johnston, 19, has reportedly been training for three hours a day, six nights a week with a body builder in preparation for the shoot.

Speaking to The AP, his lawyer said that no formal agreement has been reached but that it is a "foregone conclusion" that it will happen.

Former hockey player Johnston rose to fame as the boyfriend of Palin's 18-year-old daughter Bristol. The pair welcomed their son Tripp in December but broke up shortly after the birth.

It is believed that Alaskan-born Johnston has also been spending time in New York and Los Angeles in a bid to launch an acting career.

A spokesperson for Playgirl has yet to comment.