Simon shows up at the X Factor auditions

Cowell is at the London's auditions according to the official X Factor Twitter and a hopeful makes a grand gesture....

Cowell's in London auditioning hopefuls according to the talent show's Twitter account.

The first tweet said "Simon's back!!!!" and the second continued "Simon's just said hello to the judges".

It was also reported, still via the social networking site, that a hopeful made a marriage proposal during his audition.

The tweet said "You will never guess what just happened on stage...We've just had our first X Factor proposal!!" and then "RT (i.e. re post the tweet) If you think Simon Cowell should give the bride away!"