If you're going to mess with Blake Lively on Girlfriend’s Sister [Uncut]Twitter, you'd better be prepared for the repercussions.

A couple of months back, Lively's husband/very famous actor Ryan Reynolds wished his wife happy birthday with the following, spectacularly-cropped tweet:

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Lively clearly hasn't forgotten about it, either.

On Monday 23 October, Reynolds turned 41. And Lively took the opportunity to get some sweet, sweet revenge.

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Game, set and match.

150,000+ retweets later, and Lively was celebrating her Twitter victory.

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No response from Reynolds yet, but we have a feeling he isn't going to let this one lie...