The former X Factor judge supported Little Mix from the start on the eighth series back in 2011, coaching them to victory in the final. They are still the only group to have won the ITV talent contestant.
Reflecting on their phenomenal success since that day, Tulisa said: "I can't believe it's been four years since @LittleMix formed. I'm so proud of you and everything you have achieved. It's such a privilege to have been apart of it. Keep shinning and here's to another 4 more."
Tulisa has remained supportive of Little Mix - affectionately known as her Little Muffins - ever since X Factor and recently joined them at a party in London to celebrate the launch of their new, chart-topping single 'Black Magic'.
Today fans from around the world joined in the #4YearsofLittleMix to celebrate the band's fourth anniversary and share their love for Jesy Nelson, Jade Thirlwall, Perrie Edwards and Leigh-Anne Pinnock.
The girls are currently over in the US promoting 'Black Magic' and new album Get Weird. They performed at the Teen Choice Awards at the weekend and picked up their first-ever American award. They also joined Taylor Swift on stage at a recent concert.
10 reasons why Little Mix are fab role models: