ummm..... Is Bellatrix Lestrange the very same actress who played the role of Madame Thenardier in Les Miserables the Musical?

There is a thing called Google. Look her up. And she is Helena Bonham Carter and to answer your question, yes she is.

I havn't seen that movie so I don't know for sure, but Helena Bonham Carter (Bellatrix) has been in lots of movies and I know that was one of them, and I'm pretty sure Sweeny Todd was one, and Alice in Wonderland was another... so on and so forth.

Yup she's the same one ^_^ she plays Bella, Lovett, Madame T, and so many more awesome characters!