Guy Ritchie is set to become a father again.

The 45-year-old director and his fiancée Jacqui Ainsley are reportedly expecting their third child together after the model was spotted in London this week sporting a blossoming baby bump.

According to The Sun newspaper, the couple - who have two-year-old son Rafael and a 15-month-old daughter together - will welcome the tiny tot into the world in June via caesarean section at the Portland Hospital in London.

The pair have been in a relationship since 2010 and became engaged in 2012 after Guy popped the question to Jacqui, 32, at the Madeo restaurant in Los Angeles.

The filmmaker also has sons Rocco, 13, and David, eight, with his ex-wife Madonna and, although the pair split in 2008, he previously admitted he ''enjoyed'' their eight years of marriage.

He said last year: ''I enjoyed my first marriage. It's definitely not something I regret. The experience was ultimately very positive. I love the kids that came out of it, and I could see no other route to take.

''But you move on, don't you? You're right, I stepped into a soap opera, and I lived in it for quite a long period of my life. I'll probably be more eloquent on it 10 years from now.''