FAN GIRL ALERT! Are all the tween girls still alive out there after these tweets? Canadian born heartthrob Justin Bieber and Australian singing sensation Cody Simpson hit up the studio together last night! The Australian posted:

chilled with the mate @justinbieber in the studio tonight. look for some great records coming. #AustraliaToCanada #CoastToCoast

while Justin responded:

alot of good people in the studio tonight. been working hard. tomorrow morning #MjForever

No more information on what the duo was working on, but a song with them together would be fire.