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Sometimes, even famous athletes get starstruck when they meet another famous athlete, and that's exactly what happened to Serena Williams this week. 

The tennis star was in New York on Tuesday to attend an event when she ran into Tom Brady. Of course, if you run into Tom Brady, you need proof that you ran into Tom Brady, so Williams decided to ask the Patriots quarterback to take a selfie with her.

Brady agreed, and that's mainly because you can't say no to someone like Serena Williams.

Serena didn't just want a selfie though -- that's so 2013 -- she wanted to make an entire Snapchat video with Brady to share with her followers.

Here's a behind-the-scenes look at the selfie/Snapchat video being made. 

And yes, someone just used one form of social media (Vine) to document someone making a video on another form of social media (Snapchat) and then shared that video on another form of social media (Twitter).

Social media has officially taken over the world. 

Anyway, I'm guessing that's Brady's first Snapchat. It's probably only a matter of time before he starts his own account.

You can see Serena's entire Snapchat video below.