Owen Wilson and his former personal trainer Caroline Lindqvist are expecting a baby boy.

The duo, who made a decision to have a baby together even though they weren't in a relationship, are reportedly thrilled after finding out they will welcome a son early next year.

A source told People.com that the 44-year-old actor, who already has a two-year-old son Robert, with his ex-girlfriend Jade Duell, is getting along well with Caroline and they plan to celebrate at a baby shower in Los Angeles in December.

It was first revealed last month that 'The Internship' star is expecting a child with his long-time friend Caroline, 41.

The Swedish-born beauty - who did briefly date Owen several years ago - recently said: ''Owen and I decided to have a child even though we're not in a relationship. And we're not planning on starting a relationship, either.''

She also revealed she is six months pregnant, adding: ''Owen and I are two close friends having a baby together. We are really looking forward to it and can't wait to welcome our child at the end of January.''