Matthew Broderick broke his collarbone when he fell off a horse at the property he shares with wife Sarah Jessica Parker in northern Ireland. "When [Broderick] fell off the horse he slammed down on his left arm," a source said. "The force of that impact fractured his clavicle. He was fitted with a device to keep his shoulder in place and will have to keep pressure off his arm for several weeks... It's a painful injury and there is usually swelling." The Producers star is now reportedly resting at his Ireland home.