Rumours are rife that Charlize Theron [Images] is all set to tie the knot with beau Stuart Townsend, after the actress was spotted wearing a huge engagement ring.

The two, who starred together in a few films, have been seeing each other for five years now.

Earlier, though the Monster star had claimed that 'marriage is not her thing,' Theron's friends suggest that she has had a change of heart, according to Hello magazine.

The Oscar winner has just returned to Los Angeles after a holiday with Townsend in Belize.

The couple is busy with Townsend's directorial debut Battle In Seattle, reports Contactmusic.

The film will premiere at the Toronto Film Festival later this year.

Text: ANI | Photograph: Getty Images