Oh to have the inside scoop on what Taylor Swift and Selena Gomez were talking about at the Billboard Music Awards.

The BFFs sat together, chatted throughout the night, hugged, threw each other glances and had a great time together.

But what were they talking about?

Seems Taylor won't chat and tell...when asked that question by Access Hollywood, she teased, "Oh, you don't want to know," adding, "you do not want to open that can of worms. Especially tonight."

Yes we do!

Sounds like Sel and Taylor may have been doing some Justin Bieber trash talking...but we'll never know for sure!

We do, however, know that Taylor isn't a Bieber fan, as she was seen sticking her tongue out in disgust backstage when Selena and Justin kissed and briefly chatted.

Gallery | Taylor Swift Rocks the Red Carpet!
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