The comedian headed to the exclusive Virgin Media Louder Lounge on the second day of the festival at Hylands Park in Chelmsford, Essex, and came dressed with long hair.
The 40-year-old Celebrity Juice host donned a flowing black wig, a safari hat and black shades in the hope of fooling everybody.
Amusing Twitter fans with his new transformation, Leigh said: "Never seen Justin Lee Collins with black hair? I looked more like a hobbit version of Russell Brand or a homeless Rylan."
But Leigh had plenty of tricks up his sleeve, as he also sported a masculine look for the festival, wearing a fake beard and a short curly wig.
One person who was fooled by the disguise was TV presenter Rick Edwards, who tweeted: "@LeighFrancis I genuinely didn't recognise you."
Leigh appeared to be impressed with his makeover, as he also tweeted: "Had a great time at V Festival unrecognised."
Check out the stars at Virgin Media's V Festival below:
Copyright: Rex Features AKEM