Justin Bieber and Cady Eimer at Billboard Awards

Justin Bieber and one-less-lonely-prom-girl Cady Eimer and her sister, Holli.

Earlier @CadyEimer tweeted:

“@HolliEimer & I ARE GOING TO THE BILLBOARD AWARDS WITH JUSTIN BIEBER! dreams do come true. thank you @justinbieber and @scooterbraun !!”