Simon Cowell is known for his feisty comments and no-nonsense attitude, which has often led to disagreements with his co-stars.
Being a highly successful telly star, he's been known to argue with his Britain's Got Talent and X Factor team over what he believes is and isn't right - from behind-the-scenes to live auditions and shows.
The outspoken star has built a reputation for himself over the years for being brutally honest as a judge on his own shows. As the entertainment mogul is celebrating his 61st birthday today, here's a look back at some of the most explosive bust-ups he has had over the years - including some that happened live on air.
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