Strictly Come Dancing: Alexandra Burke brings The X Factor to brand new trailer as build up to launch show steps up

Strictly Come Dancing: Alexandra Burke is the first celebrity seen in the trailer The new trailer shows the stars donning the sequins and shimmying around the ballroom to form a brand new ident advertising Strictly Come Dancing.  The X Factor star Alexandra Burke kicks off the trailer by humming out one of the most well-known tunes on the BBC.  As the singer puts…