Miley Cyrus and Justin Gaston(WireImage)

What we mean when we say upgrade or downgrade, you ask? What did you think of Katy Perry moving on to Russell Brand from ex-boyfriend Travie McCoy? What about Gisele Bundchen moving on to Tom Brady after Leonardo DiCaprio? And Miley Cyrus with Justin Gaston to being with Liam Hemsworth?

Check out this gallery we have put together to see what we think; then you decide whether or not your favourite celebrities' new partner is an upgrade or a downgrade from their old flames.

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