August 15, 2022 | 3:58pm

Happy birthday, Dixie D’Amelio!

The TikTok star, who turned 21 on Aug. 12, celebrated her special day with friends and family in Las Vegas last week.

The birthday girl was joined at Resorts World Las Vegas by her 18-year-old sister, Charli D’Amelio – who brought along boyfriend Landon Barker – and parents Heidi and Marc D’Amelio.

“Dixie had a great time celebrating her 21st birthday this weekend,” an insider exclusively told Page Six on Monday.

“Her and her friends were dancing, drinking beer and enjoyed bottle service at the club.”

We’re told Dixie kicked off the festivities by rolling up in a Rolls Royce with some of her influencer friends to enjoy dinner at the resort’s restaurant, Carversteak, Thursday night.

The next morning, on her actual birthday, Dixie and the crew started off their celebrations by relaxing poolside. They enjoyed an afternoon brunch at one of the resorts Palaces, which is described as offering guests a “first-class” experience in a press release obtained by Page Six.

They then activated party mode, enjoying a champagne-fueled dinner at contemporary Asian spot Fuhu where we’re told the group sipped on Dom Perignon.

Dixie D'Amelio, Charli D'Amelio and their parents in Las Vegas with a cake.The birthday girl’s sister, Charli, and their parents also joined in on the wild festivities. Tony Tran / Resorts World Las Vegas

Following the luxuriouos meal, Dixie and her entourage hit Zouk Nightclub where they partied the night away at a table on the stage.

We hear Dixie took photos with fans in the crowd and even hopped behind the DJ booth while Louis The Child performed as the evening’s entertainment.

Dixie D'Amelio parting in Las Vegas for her 21st birthday.She hit the Vegas nightlife with a $2,300 Balenciaga shoulder bag. Tony Tran / Resorts World Las Vegas

Dixie, who boasts 57.4 million followers on TikTok, looked sexy in a sheer knitted midi dress that left little to the imagination.

She accessorized with a black Le Cagole Balenciaga shoulder bag, which retails for $2,300.

Dixie D'Amelio and her friends at Carversteak in Las Vegas.The massive party crew also included Charli’s boyfriend Landon Barker. Tony Tran / Resorts World Las Vegas

The club presented Dixie with a massive custom birthday cake, and at the end of the evening, she and her pals took in a beautiful fireworks display to close out the night.

But the partying didn’t stop there! The next day, she and her guests spent the afternoon at Resorts World Las Vegas’ pool party, Ayu Dayclub, where they had a private bungalow as DJ Snake spun tunes.

They then wrapped things up with a delicious dinner at Wally’s Wine & Spirits before completing the festivities with a nightcap at Gatsby’s Cocktail Lounge.