Hilary and Haylie Duff's Sisterly Sweat Session

Posted Wednesday August 24, 2011 10:39 AM GMT

Stepping out for a sisterly sweat session, Hilary and Haylie Duff hit up a West Hollywood, California gym together on Wednesday (August 23).

Ready to kick it up with some cardio, the 23-year-old mom-to-be and her "Napoleon Dynamite" starlet sis dressed in loose gray tops and black spandex as they tended to their fitness regimen.

As previously reported by GossipCenter, Hilary has officially been dropped from the forthcoming indie film, "The Story of Bonnie and Clyde," a remake of the 1967 classic.

Movie producers told press they could not wait until July, when Duff expected to be able to begin work, adding, "Due to our obligations with investors and international buyers it is imperative that we stick to our current schedule. Therefore we are forced to explore other options for the two lead roles. Unfortunately this happens all the time in the world of filmmaking."

Enjoy the pictures of sisters Hilary and Haylie Duff heading to an afternoon workout at a West Hollywood, California gym (August 23).

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