The N-Dubz singer mentored Little Mix to victory on the eighth series of X Factor in 2011, making them the first group to win the competition.
Yesterday, Tulisa wished the band a happy third anniversary by Instagramming a picture from their time at her judges' houses three years ago.
She said: "Happy 3rd Birthday @littlemixofficial."
Tulisa had been joined by guest judge Jessie J in Mykonos to decide which the groups to bring through to the live shows. Little Mix had been formed exclusively for X Factor - a decision which turned out to be pretty amazing considering they won and have since enjoyed huge success in the UK and overseas.
Little Mix - which features Jade Thirlwall, Jesy Nelson, Perrie Edwards and Leigh Anne Pinnock - thanked fans for their support yesterday, tweeting: "Who'd have known that all thanks to hard work, great team, friendship and incredible fans we'd be where we are now.
"Thank you so much for giving us the best 3 years of our lives."
Watch Little Mix's three-year message to fans below: