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Hilary Duff may have a bun in the oven, but that doesn't mean she can't keep working on her fitness!

The expectant mamma had that pregnancy glow as she headed off to play a game of tennis with her big sis Haylie in LA, on Tuesday.

And while Duff is prepping for baby, she won't have to worry about how to hide that bump in the upcoming The Story of Bonnie and Clyde flick.

After much speculation about Duff's starring role in the film, which is slated to begin shooting later this year, The Hollywood Reporter announced Tuesday the former Disney star will not star as Bonnie Parker.

Which budding starlet should fill Duff's shoes as America's sexiest outlaw?