Britain’s Got Talent: Simon Cowell butt of book jokes as Pudsey the dog and Only Boys Aloud go through

Simon Cowell and Pudsey the dog shared the limelight this evening as the Britain's Got Talent LIVE finals kicked off.

Simon Cowell, who has been all over the headlines recently thanks to a revealing new biography, found himself the butt of the majority of the jokes on BGT.

And Pudsey the dancing dog was the clear winner of the first Britain's Got Talent semi-final, melting even Simon's heart as he took to the stage with his owner Ashleigh.

Fellow judge David Walliams opened the show by poking fun at Simon Cowell by reading the unauthorised biography at the judges' table.

David Walliams referenced Simon Cowell's biography/Rex

And the book , which revealed an affair with X Factor judge Dannii Minogue and his embarrassing crush on Cheryl Cole, was subtly (and not so subtly) referenced throughout the live ITV1 show.

After the first act Mr Zip performed Simon Cowell told the contestant: "You obviously had a great time with all those hot dancers up there."

Amanda Holden also made fun of Simon Cowell's book/Rex

This paved the way for co-judge Amanda Holden to joke: "Oi no more of that. We don't want a trilogy in that book deal" to which Simon retorted "careful".

Comedian David hit back in defense of Mr Cowell and perpetuated the pair's bromance saying: "Don't attack my Simon."

But he later referenced the book himself, straight after Pudsey the dog's performance left SiCo grinning from ear to ear.

[Related VIDEO: Exclusive interview with Pudsey the dog & Ashleigh]

[Related story: Simon Cowell & David Walliams fancy the same women]

David said to owner Ashleigh: "Thank you for making my Simon so happy. He's had a difficult few weeks".

Pudsey and Ashleigh wowed the crowd - and viewers at home - with their amazing dancing skills.

Ashleigh and Pudsey sent Twitter made/Rex

'I Want That Dog' was trending on Twitter throughout the evening and judge Alesha Dixon said he was her favourite act of the night.

Pudsey's popularity was reflected in the voting, with the dog and his owner sailing through.

The other two acts in the top 3 spots were Mancunian boyband The Mend and Welsh schoolboy choir Only Boys Aloud.

With the judges divided on who should take the second spot in the final (David and Amanda went with Only Boys Aloud while Simon and Alesha voted The Mend), it was back to the viewers' votes to decide.

Only Boys Aloud took the other final place/Rex

That left Only Boys Aloud victorious and The Mend heading on their way home.

The Mend lost out to Only Boys Aloud/Rex

They were joined by 12-year-old Lauren Thalia - who sung Labrinth's Earthquake - Mr Zip, Jive Aces, Analiza and United We Stand.