Jennifer Lopez made the rookie error of forgetting that there are eyes everywhere at shows such as the Billboard Music Awards, so when she got bored during Mariah Carey's performance everyone kinda noticed...

But what we want to know is what was so important that she just had to check while good ol' Mariah was belting one out? Here are our guesses...

1. Looking at Instagram to see how on fleek she was on the red carpet...

3.Asking Siri if this performance will ever end...

4. Checking to see whose album is higher in the charts, hers or Mariah's...

5. Searching on Google "Who is hotter Mariah or JLo"...

6.Texting Booty pal Iggy Azalea...

7. Looking at pics of her ridiculously adorable kids...