Louis Walsh got a lapdance from a Britney Spears lookalike on The 'X Factor' yesterday (31.05.12).

The judge looked terrified as raunchy Britney impersonator Lorna Bliss crawled off stage and onto his lap during the auditions at London's O2 Arena.

Lorna - who also auditioned for 'Britain's Got Talent' in 2011 - then moved on to fellow judge, Gary Barlow, but he escaped before she could approach him.

Wearing only a white bodystocking, she chased the Take That heartthrob around venue - much to the delight of Tulisa Contostavlos and guest judge Nicole Scherzinger.

When asked to vote, Gary joked: "It's a no from me, but thank you for sitting on Louis' face."

The live audience certainly enjoyed the show, with one 'X Factor' fan tweeting: "Omg. Lorna Bliss. Never laughed so much. Louis got a facefull ;-)(sic)"

Britney lookalike Lorna has spent £170,000 copying the 'Toxic' hit maker's trademark look and has previously appeared on makeover show 'Snog, Marry, Avoid'.

The gutsy blonde caused controversy last year after Simon Cowell overruled his fellow 'BGT' judges to put her through to the semi-finals.

She has also accused 'X Factor' contestant Kitty Brucknell of stealing Johnny Depp lookalike boyfriend Danny Lopez.