Ariana Grande shakes it up in purple circle-patterned skirt and top at iHeartRadio Pool Party as she turns 21 years old

Ariana Grande turned 21 years old on Thursday and just in time for Miami Beach's biggest pool party of the year.

The singer continued the celebration onstage during Day One of iHeartRadio Ultimate Pool Party on Friday in Florida.

Ariana stood out in a uniquely revealing top and mini-skirt set featuring a geometric pattern of purple circles interspersed with sheer skin-tone panels.

Purple power: Ariana Grande stood out in a purple mini-skirt and top patterned with circles while performing on stage at iHeartRadio Ultimate Pool Party in Miami, Florida on Friday

Purple power: Ariana Grande stood out in a purple mini-skirt and top patterned with circles while performing on stage at iHeartRadio Ultimate Pool Party in Miami, Florida on Friday

The energetic star entertained while outfitted in a pair of lavender-hued platform boots, and huge dangling earrings that matched her two-piece dress provided more dazzle.

Ariana's long, waist-length hair was pulled back with the top portion bound in a tight ponytail, and the wavy tresses shrouded her bare arms and shoulders like a shawl.

The former star Nickelodeon's Victorious got to celebrate her 21st birthday at the Walt Disney Resort in Florida earlier this week.

Cause for celebration: The former Nickelodeon star turned 21 years old on Thursday and carried the celebration on stage on Day One of Florida's biggest pool party of the year

Cause for celebration: The former Nickelodeon star turned 21 years old on Thursday and carried the celebration on stage on Day One of Florida's biggest pool party of the year

Sing it out: Ariana's voice rang out loud and clear at the event that took place at Fountainbleau Miami Beach

Sing it out: Ariana's voice rang out loud and clear at the event that took place at Fountainbleau Miami Beach

Fashion statement: The Victorious star paired her revealing two-piece outfit with lavender-hued platform boots

Fashion statement: The Victorious star paired her revealing two-piece outfit with lavender-hued platform boots

Birthday girl: Ariana was joined by Cinderella and Prince Charming at her 21st birthday celebration at Walt Disney World Resort in Florida on Tuesday

Birthday girl: Ariana was joined by Cinderella and Prince Charming at her 21st birthday celebration at Walt Disney World Resort in Florida on Tuesday

She was pictured wearing Minnie Mouse ears while looking cute in a white crop top and a flaring, black-and-white skirt.

Ariana was obviously excited about performing for the thousands of fans at the third annual iHeartRadio Pool Party, which was held at Fountainbleau Miami Beach and presented by VISIT FLORIDA. 

'See u soon Miami,' Ariana tweeted earlier on Friday.

Cheerleader: Izzy Azalea gave Ariana some competition in white athletic shorts and a lacy two-part top during her performance

Cheerleader: Izzy Azalea gave Ariana some competition in white athletic shorts and a lacy two-part top during her performance

Show stopper: Izzy showed off some of her moves while singing with microphone in hand
Show stopper: Izzy showed off some of her moves while singing with microphone in hand

Show stopper: Izzy showed off some of her moves while singing with microphone in hand

Spirited: Host Nick Cannon showed his spirit in starry socks and red shorts paired with denim vest and red cap

Spirited: Host Nick Cannon showed his spirit in starry socks and red shorts paired with denim vest and red cap

Plenty of bling: Nick had fun hamming it up for the cameras while displayed numerous chain necklaces

Plenty of bling: Nick had fun hamming it up for the cameras while displayed numerous chain necklaces

Show off: All eyes were on Nick Cannon as he walked on stage and showed off his amazing abs

Show off: All eyes were on Nick Cannon as he walked on stage and showed off his amazing abs

The event also brought out Iggy Azalea, Lil Jon and Nick Cannon, who hosted the two-day extravaganza, and Jennifer Lopez, Neon Trees, Tiesto, Magic! and many more were on the list to perform.

Australian singer Iggy Azalea, 24, gave Ariana some competition by wearing white athletic shirts and a white lace top and bra along with a practical pair of silver trainers.

The blonde singer wore her long hair in a high ponytail as she strutted on stage with microphone in hand.

Trendy: Izzy Azalea arrived looking sporty in crop top and leggings with blue blouse while Madison Beer kept it sporty in white jeans and black top
Trendy: Izzy Azalea arrived looking sporty in crop top and leggings with blue blouse while Madison Beer kept it sporty in white jeans and black top

Trendy: Izzy Azalea arrived looking sporty in crop top and leggings with blue blouse while Madison Beer kept it sporty in white jeans and black top

Who's ready to party: Jake Miller revved up the red carpet in an all-black outfit and camouflage cap while Lil Jon sported rainbow colours
Who's ready to party: Jake Miller revved up the red carpet in an all-black outfit and camouflage cap while Lil Jon sported rainbow colours

Who's ready to party: Jake Miller revved up the red carpet in an all-black outfit and camouflage cap while Lil Jon sported rainbow colours

Unbreakable singer Madison Beer, 15, whom Justin Bieber helped to propel to stardom after tweeting a link to one of her YouTube videos, looked cute in white jeans and a black top, as well as rugged black boots.

Us Against Them star Jake Miller showed up in black jeans and black T-shirt topped with a camouflage cap.

Lil Jon performed an energetic show while wearing a rainbow-coloured T-shirt.

Host Nick Cannon was a spirited sight in starry socks, red shorts, denim vest and red cap.

Big energy: Lil Jon gave his best on stage while showing off some lunge moves

Big energy: Lil Jon gave his best on stage while showing off some lunge moves

Crowded house: The pool party brought a lot of bikini-clad fans

Crowded house: The pool party brought a lot of bikini-clad fans

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