Heath Ledger and Michelle Williams
04/21/2005 at 04:00 PM EDT
Australian actor Heath Ledger and his American girlfriend, Michelle Williams – formerly of The WB's Dawson's Creek – are expecting a baby, sources close to the couple tell PEOPLE.
Williams, 24, has been spotted attending prenatal yoga classes in Australia.
A rep for Williams has "no information" on baby news. Ledger's spokesperson couldn't be reached for comment.
Ledger, 26, who's next due to appear in the skateboard film Lords of Dogtown, split from actress Naomi Watts in April 2004. He and Williams costar with Jake Gyllenhaal in another upcoming film, Ang Lee's cowboy tale Brokeback Mountain.