The singer was spotted chatting to the 'Baby' hitmaker backstage at the ceremony in Nashville, Tennessee.
The 16 year old was at the ceremony to present a prize with Scotty Mccreery, who she lost out to in the final of the TV talent show.
When the last series of 'American Idol' started Lauren and the other contestants were asked who their celebrity crushes are, and Lauren admitted at the time it was the diminutive Canadian pop star.
She said: "Oh, I don't wanna say! It's Bieber, I guess. I don't have Bieber Fever, but he's cute!"
He went home with the Collaborative Video of the Year trophy for his song 'That Should Be Me' with Rascal Flatts.