Uma Thurman

Maternity wear? ... Uma Thurman loosens up for the Tommy Hilfiger show.

Elle Macpherson's sons are going to have a half brother or sister with reports that Uma Thurman is pregnant.

Thurman and her boyfriend businessman Arpad Busson are reportedly expecting a child together later this year.

Australian supermodel Macpherson had two sons with the Frenchman, Flynn, 14 and Aurelius, 9. Macpherson and Busson were engaged but the wedding was called off in 2005.

Thurman, 41, also has two children from her previous marriage to Ethan Hawke, Maya, 13 and Levon, 10.

A source close to the actress told US magazine Life & Style that Thurman is delighted to be adding to her family.

"Yes, Uma is pregnant" the friend told the magazine.

"She hasn't announced it yet, but a lot of her friends were asking her because they could tell the difference when they saw her at New York Fashion Week.

"She's usually so skinny, but now she has the cutest little bump and a glow about her," the friend said.

The former model and star of films Pulp Fiction and Kill Bill was in the front row of the Tommy Hilfiger runway show on February 12 and was unusually covered up in a baggy dress and a loose fitting jacket.

"She's excited," the source added.

"She's happy and just a few months along right now. She's due in late, late summer."

Thurman started dating Arpad in 2007 but they split in late 2009. However, they rekindled their romance last year and have maintained their relationship since then.

Agencies