Thurman's new arrival will join her older children Maya, 13, and Levon, 10, whom she welcomed with ex-husband Ethan Hawke. Hawke, who married his and Thurman's one-time nanny Ryan Shawhughes in 2008, has two children of his own: Clementine, 3, and Indiana, 6 months.\
Following a brief split, Thurman, 41, recently rekindled her romance with financier beau Arpad Busson in 2011.
Thurman's film, Bel Ami, in which she plays Robert Pattinson's love interest, hits theaters next month.
