It had been reported Simon Cowell had blocked his fellow judge from showcasing her latest single, 'Stop', on one of the live shows.
The Sun claimed the former Mis-Teeq singer wanted to use 'BGT' as a way of relaunching her solo career, following disappointing sales figures for her latest album, 'Do It For Love', which was released last year.
A source told the paper: "Alesha is disappointed to miss out but appreciates she can’t complain too loudly.
However, she has now addressed the reports on Twitter, insisting the reports are false.
In reply to a fan, she wrote: "Hey darling, I haven't been banned! I told you don't believe what u read! Papers having a party right now! pmsl :)"
Alesha - who was caught up in controversy this week, when she called a group of black 'BGT' contestants "sexy, chocolate men" - previously performed her single 'The Way We Are' during last year's semi finals.
Former 'BGT' champ George Sampson has also revealed he will be appearing, in what is likely to be a celebration of the show's 10th series.
'Britain's Got Talent' concludes on Saturday at 7.30pm on ITV.