Can I turn my seatpost round?

Meachley

I have bought the Cannondale Caad 8.  I am yet to ride it out owing to looking after my children (priorities I suppose!) so am yet to do a decent ride! I had been told prior to purchase about the possibility of turning the seatpost round, but then forgot about this during the fitting of the bike.  I will be asking when it goes back for it's service however in the meantime was wondering what the opinions were.  My bike has aerobars on.  Thanks!