Crowe, 48, retweeted Boris Prso's split pic of the celebs in costume on Monday, with Boris writing: "hey @britneyspears did you see @russellcrowe in #lesMis maybe he is fan of you."
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The tweet was a hit, getting nearly 500 retweets.
Check out Spears' super-fun Toxic video below and let us know: Who wore it best: Britney or Russell?