Uma Thurman
is having another baby!

The 41-year-old actress is pregnant with her third child, a rep tells PEOPLE.

While she already has two children -- 13-year-old Maya and 10-year-old son Levon -- with ex-husband Ethan Hawke, this will be her first child with boyfriend/financier Arpad Busson.

No word yet on how far along she is -- but Uma hid all evidence of a baby bump by wearing an over-sized blazer and loose fitting clothes at the Tommy Hilfiger show at Mercedes-Benz Fashion Week earlier this month.

While many are surprised with Uma having another baby at 41, it's nothing new in Hollywood.

Recently, stars like Halle Berry, Mariah Carey and Kelly Preston all gave birth after turning the big 4-0.

See more in the gallery above!

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