Don't worry, you're not the only one asking...

Paulina Rubio becomes a judge instead of Britney and L.A Reid .. But seriously who is she ?

— Monny (@JonasBArabia) May 21, 2013

Good morning!! Who is still wondering who the hell is Paulina Rubio raise their hands!!!

— Vanessa Bebiano (@vanbebiano) May 21, 2013

I have no idea who Paulina Rubio is but hot damn. She's super hot. twitter.com/Taithleach/sta…

— Kyle Brooks (@Taithleach) May 20, 2013

@thexfactorusa I dun even know who @paurubio is..

— Angelica Speruzzi (@AngSperuzzi) May 21, 2013

i bet demi didnt know who paulina rubio was. she probably googled her

— leslie†(@eternitylovato) May 21, 2013

Kelly Rowland should be good on US XFactor although who the hell Paulina Rubio? Eh its no Mariah and Nicki lineup. #USXFactor

— Tom Ryan (@ryanto86) May 21, 2013

Backstage at the Billboard Music Awards, when she spots Selena Gomez and Justin Bieber...

I am a huge fan of the 70's vibe in Bruno's new song, "Treasure". But there is a bit of drama surrounding another song by Breakbot called "Baby I'm Yours". Apparently Bruno wanted to cover it on his new album "Unorthodox Jukebox" but was denied. Is it a coincidence that the songs sound similar?