According to BroadwayWorld.com:
"Well, it was just a matter of time as the Broadway rumor mill had been grinding steadily about the highly-anticipated summer presentation at the Hollywood Bowl of Les Miserables in Concert....
But, the espionage continues. There have been rumblings along the Rialto of people who had been cast in roles and everyone was pretty much sworn to secrecy, as they also knew who else had been hired and the Bowl today confirmed what we sort of already knew, and happily, last night on both coasts, two of the leads - Melora Hardin from The Office was a guest on Carson Daly and Lea Michele who was making her debut at Feinstein's, both told their respective audiences of their excitement at being cast in a show, in which they both admitted to being among an amazing group of performers. But, to their credit, neither of them mentioned anyone else in the cast.
So, last night, in all the chat rooms and blogospheres, people went "insane" with excitement that Hardin was cast as Fantine and Lea Michele will be playing Eponine. The rest of the cast currently in place, and according to the Hollywood Bowl press office are Rosie O'Donnell (Madame Thernardier), Lea Michele (Eponine), Brian Stokes Mitchell (Javert), J. Mark McVey (Jean Valjean), Melora Hardin (Fantine) and Lea Michele (Eponine) and Aaron Lazar (Enjolras)."