She's got some front! Demi Lovato wears a tiny and very risque bikini top as she celebrates new single Cool For The Summer at NYC pool party

PUBLISHED: 03:56, 2 July 2015 | UPDATED: 13:46, 2 July 2015

Earlier that day she took to Twitter to defend her new single Cool For The Summer, after some fans alleged it sounded like Katy Perry's I Kissed A Girl and Jessie J's Domino.

However, 22-year-old Demi Lovato shook off the criticism on Wednesday and celebrated the hit - already number one on iTunes - with a pool party thrown by radio station Z100 at Gansevoort Park Avenue in New York City.

She put her trim figure on display in a risque black bikini top with revealing cut-outs as she hit the stage before taking a dip alongside fans.

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Edgy: Demi Lovato flaunted her curves in a risque black bikini top and high-waisted shorts as she performed her new single Cool For The Summer at Z100's pool party in New York City on Wednesday

Demi wore a revealing black bikini top underneath a sleeveless dark wash denim jacket, which she later removed while performing.

She coupled those with a pair of high-waisted, distressed denim shorts, and finished off the look with an edgy pair of gladiator-style thigh-high black heels with a peep toe.

The former Disney Channel star wore her short, raven locks styled in loose waves, and accentuated the eye-catching look with a bright red lipstick.

Cover up: At first Demi covered her revealing look with a denim jacket, though she later removed it during her performance

Fan friendly: The former Disney Channel star posed for fan photos while onstage

Showing some skin: The raven-haired beauty showed off her toned body in a barely-there bikini top and thigh-high gladiator heels which emphasized her athletic legs

She showed off a white manicure, and accessorized with a pair of dramatic, dangling earrings with blue tassels.

After entertaining the crowd with her sultry new hit, Demi hopped right into the pool -shoes and denim shorts still on - and then posed for selfies alongside her dedicated fans.

She took to Instagram after the party - showing off dripping wet locks post-swim as she stood alongside two girls in towels - and shared her excitement over the promotional tour.

Demi Lovato jumps into swimming pool at NYC rooftop party

Drama: Earlier in the day Demi fought off criticism that her new single sounded like Katy Perry's 2008 hit I Kissed A Girl and Jessie J's 2011 single Domino

Colorful: Demi added a pop of color to her monochromatic look with a pair of dramatic, dangling earrings with brightly colored beads and blue tassels

'#CoolForTheSummer Day continues I'm taking over @ElleUSA's Instagram account this weekend, make sure you follow them!!' she wrote.

The hitmaker was then spotted leaving the New York City hotel in a chic blue and white patterned dress.

The revealing number hugged the songstress's curves, and also showed off her toned midriff with a large cut-out.

Captivated: Fans sang along to the new single from the hotel's pool, which was decorated with colorful beach balls and pool toys

Cannonball! Following her performance Demi hopped right into the water - heels and all - to celebrate with her fans

Patient: The songstress took time to pose for selfies alongside all of her fans after her performance

Her dark locks were slicked back following her dip in the pool, and she accessorized the look with a pair of white peep toe heels.

Demi showed off a wide grin - and bright red lipstick - as she left the hotel, and was seen carrying a bright yellow Celine handbag.

Earlier in the day she had taken to Instagram to celebrate her single reaching number one on iTunes, writing: 'HOLY S*** #1 ALREADY?!?!?! YOU GUYS ARE AMAZING I LOVE YOU ALL SO MUCH #CoolForTheSummer'

Center of attention: Demi was swarmed by fans after she hopped into the pool during Z100's Cool For The Summer pool party

The aftermath: The hitmaker posed for photographs after her jump into the pool, during which time it seems she lost one of her earrings

Celebrating: After the pool party Demi posted this snap to instagram, excitedly sharing: '#CoolForTheSummer Day continues I'm taking over @ElleUSA's Instagram account this weekend, make sure you follow them!!'

She also teased the single's upcoming music video, by posting a few behind-the-scenes shots from onset.

In one photo the star looked glamorous as she posed alongside Roxanne Margaret, who will star with the songstress in the upcoming video.

Both women sport dramatic winged eyeliner and glossy pink lips in the photo, which Demi captioned: 'Got some gorge girls in my #coolforthesummer video including this b****.. @roxanne_margaret is officially my video hoe.'

Demure: Following her risque performance attire, Demi got a bit more demure in a fitted blue and white dress with cut-outs

Blue belle: Demi stunned in a midriff-baring blue and white dress, which she coupled with a pair of coordinating white heels

Showing off her fashion credentials: The performer accessorized her chic look with a bright yellow Celine handbag

Demi Lovato steps out in NYC in colorful playsuit

A second shot showed Demi cuddling up to 35-year-old beau Wilmer Valderrama, as she sports a red faux fur coat.

'My love... Always supporting me on set... At 4 am even if he has to get up to work at 8.. [heart emojis],' she wrote, of her long-time boyfriend.

Demi also took to Twitter to tease the video, posting: 'Well... After a long night of sweat, baby oil, and lots of skin... That's a wrap #CoolForTheSummer'

Teasing: Demi had taken to Instagram the previous day, sharing a behind-the-scenes snap from Cool For The Summer's upcoming music video alongside co-star Roxanne Margaret

'My love' She also posted a picture alongside boyfriend Wilmer Valderrama, gushing: 'Always supporting me on set... At 4 am even if he has to get up to work at 8.. [heart emojis]'

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Thursday, 2 July 2015

Demi Lovato wears a tiny and very risque bikini top as she celebrates new single Cool For The Summer at NYC pool party

She's got some front! Demi Lovato wears a tiny and very risque bikini top as she celebrates new single Cool For The Summer at NYC pool party