The girl band star, who recently gave birth to twins, turned 30 earlier this month on October 4.
But she celebrated in style with an epic bash on Saturday night with all her family and close friends in attendance.
Leigh-Anne looked amazing in a red animal print jumpsuit and diamond jewellery – including her £40,000 engagement ring.
She was joined by her fiance and partner of five years, Andre Gray, and sister Sairah, who gave fans a glimpse inside the big bash on her Instagram stories.
Leigh-Anne looked like she was living her best life as she danced and posed for photos with pals.
At one point in the night she even took to the stage with her fiance to give a birthday speech – and she made reference to her fall out with Jesy this week.
Looking a little worse for wear, Leigh-Anne said: “Bear with me as I’m a bit drunk. Firstly, I want to thank you guys for joining me tonight. Thank you.
“I don’t think I’ve ever seen such an amazing set up – Sairah, amaze, you’re amazing.”
The singer then appeared to address the recent fall out with Jesy, who she reportedly accused of ‘blackfishing’ amid a row over her video for debut solo single Boyz.
Blackfishing is when a white person pretends to be black or mixed race for their own gain, which could include to make money or further their career.
Carrying on her party speech, Leigh-Anne told her family and friends: “I’m 30 years old. I know my character, you know my character, anyone that meets me knows my f***ing character – and that’s all I care about.
“I’m so proud of everything I’ve achieved. The most beautiful fiance, who I’m still obsessed with even after five years. I love you.
“And the two most beautiful, perfect babies.”
In leaked DMs, believed to have been sent from Leigh-Anne’s Instagram account to a fan, she allegedly calls Jesy a “horrible person” and says: “She blocked us. Cut us off.”
Another message appears to show Leigh-Anne encouraging the fan to embarrass Jesy, stating: “Do a video about her being a blackfish instead.”
The comments came after Jesy’s debut solo single, Boyz. featuring Nicki Minaj, was released last week.
In the video, Jesy sports a dark tan and has her hair in braids, sparking the ‘blackfishing’ backlash.
While Leigh-Anne partied, her former bandmate Jesy – who still got to Number 5 in the UK charts with her new single this week – was downing cocktails with pals elsewhere.
It follows the news Little Mix are set to split up, with an announcement rumoured to be planned in the next few weeks.
Little Mix were put together on The X Factor after all four girls auditioned separately and became the first band to ever win the show back in 2011.
With hit singles like Wings, Black Magic and Shout out to My Ex they quickly became the biggest UK girl band since the Spice Girls, selling 60 million records worldwide.
This year marks their 10th anniversary.