She stopped to chat with us on the Cambio blue carpet and told us how she's feeling as she's heading in to the show and what she most wants to do while she's in Vegas.
Plus, she tells us what it was like working with Nicki Minaj and what inspired her new look (which we love!)
Check out the video above to Carly spill about all of that and more!
Don't forget, Cambio has you covered for all of your Billboard Music Awards needs. We've got the Blue Carpet Arrivals, all the winners, the best backstage moments and more, so keep checking back for updates!
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Gallery | 2013 Billboard Music Awards: Best and Worst Dressed