American actress Michelle Williams is reported to be engaged and expecting her second child.

Sources have told People magazine that the Brokeback Mountain and Dawson's Creek star has accepted a marriage proposal from Tony Award-winning director Thomas Kail and is also pregnant with his baby.

39-year-old Williams is already mother to Matilda, her 14-year-old daughter from her relationship with the late Heath Ledger, who died in January 2008.

The four-time Oscar nominee worked with Kail on the hit TV series Fosse/Verdon – where she was outstanding as dancer and actress Gwen Verdon, and went on to win an Emmy Award for the part.

Michelle Williams with Sam Rockwell in Fosse/Verdon

Although pretty anonymous this side of the Atlantic, Kail is best known in the USA for directing the Off-Broadway and Broadway productions of Lin-Manuel Miranda's In the Heights and hip-hop hit Hamilton.

The engagement news comes less than a year after Williams split from musician Phil Elverum, to whom she was briefly married from 2018 to 2019.

This will also be 42-year-old Kail's second marriage - he previously tied the knot with actress Angela Christian.