Danica McKellar and Valentin Chmerkovskiy

Danica McKellar broke a rib while rehearsing for Dancing with the Stars, The Wonder Years alum wrote on Twitter Friday.

"So... I broke a rib in yesterday's #DWTS rehearsal," she wrote. "Trying my best to pull [through] and could use your prayers!! #wanttokeepdancing." She tweeted another update after Friday's rehearsals: "It's tough dancing with a broken rib. @iamvalc choreographed an amazing routine- fingers crossed I can pull it off! :/"

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On Saturday, McKellar reported that she was wearing a rib brace underneath the dress she was wearing while speaking at the USA Science and Engineering Festival in Washington, D.C.

This isn't the first time a Dancing competitor has been injured on the show. Check out a full gallery's worth of injuries here.

Dancing with the Stars airs Mondays at 8/7c on ABC. Watch the latest episode here.