Britney Spears could take a few pointers from Paul Rudd.

The "Anchorman" star had a pretty incredible lip sync battle with Jimmy Fallon on "The Tonight Show" last night -- where Rudd absolutely slayed Tina Turner's "Be Good to Me" and Queen's "Don't Stop Me Now."

The latter was so good, Fallon just gave up ... because there was no topping the moves Rudd was throwing down. Freddie Mercury would definitely be proud!

This isn't Jimmy's first lip sync battle though. 

During his "Late Night" run Fallon challenged both Joseph Gordon-Levitt and John Krasinski ... and lost both times.

Someone clearly isn't practicing enough at home!

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