'Behave yourself!': Harry Styles acts as the protective brother as he jokes about keeping an eye on his older sister Gemma during her date at One Direction gig

By Sharnaz Shahid for MailOnline

Published: 02:39 EST, 23 September 2015 | Updated: 10:44 EST, 23 September 2015

He may be the one of the biggest pop sensations in the world, but that hasn’t stopped Harry Styles from being super protective when it comes to his loved ones.

During One Direction's highly-anticipated set at Apple Music Festival on Tuesday, the 21-year-old frontman joked that he was keeping his eye on his sister Gemma, who had brought a date to their gig.

‘Sorry if I seem a little distracted,’ he told the buzzing crowd. ‘My sister is on a date. They're up there somewhere... So just please behave yourselves, it's disgusting.’

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'Behave yourself!': Harry Styles joked that he was keeping his eye on his sister Gemma during her date at a One Direction gig on Tuesday 

'Behave yourself!': Harry Styles joked that he was keeping his eye on his sister Gemma during her date at a One Direction gig on Tuesday 

While bandmate Liam Payne chipped in: ‘We're all watching you!’

No doubt a little horrified about the singer’s remarks, Gemma was later seen enjoying a dance with a girlfriend as they sang loudly to 1D hits, according to The Mirror newspaper.

The chart-toppers kicked things off with Steal My Girl, before singing a variety of hits including Little Things and Midnight Memories.

Letting her hair loose: No doubt a little horrified about the singer’s remarks, Gemma was later seen enjoying a dance with a girlfriend as they sang loudly to 1D hits

Letting her hair loose: No doubt a little horrified about the singer’s remarks, Gemma was later seen enjoying a dance with a girlfriend as they sang loudly to 1D hits

'Distracted': Harry, 21, told the buzzing crowd, ‘My sister is on a date. They're up there somewhere... So just please behave yourselves, it's disgusting’

'Distracted': Harry, 21, told the buzzing crowd, ‘My sister is on a date. They're up there somewhere... So just please behave yourselves, it's disgusting’

Ahead of the show, supporting act Little Mix performed a show-stopper of a set to hundreds of lucky fans at the Roundhouse in London's Camden.

Putting on a passionate performance, the girls showed off their impressive vocal ability and killer dance-moves as they got the crowds ready for 1D's performance.

It's been six months since Perrie Edward’s ex Zayn Malik quit the band to focus on being a 'normal 22-year-old.'

See more of the latest Harry Styles news, pictures and videos 

Clos pals: Meanwhile, fellow bandmate Liam Payne chipped in, ‘We're all watching you!’

Clos pals: Meanwhile, fellow bandmate Liam Payne chipped in, ‘We're all watching you!’

Doing his thing: Along with the rest of 1D, Harry played an incredible set at Apple Music Festival on Tuesday

Doing his thing: Along with the rest of 1D, Harry played an incredible set at Apple Music Festival on Tuesday

Hitting all those high notes: The British heartthrob showcased his vocal talents to the max
Hitting all those high notes: The British heartthrob showcased his vocal talents to the max

Hitting all those high notes: The British heartthrob showcased his vocal talents to the max

Meanwhile, also on Tuesday, One Direction band announced the launch of their fifth album, named Made In The UK.

They released the news of the pre-album launch with a video message which delighted their fans, with the full album being released globally on Friday November 13th.

The release follows on from the massive success of first single Drag Me Down which went to Number One on 90 iTunes charts and broke streaming records globally.

It's a busy week for the popular band who will kick off the UK and EIRE leg of their On The Road Again Tour with six nights at London's O2 Arena.

Former X Factor stars: The chart-toppers kicked things off with Steal My Girl, before singing a variety of hits including Little Things and Midnight Memories

Former X Factor stars: The chart-toppers kicked things off with Steal My Girl, before singing a variety of hits including Little Things and Midnight Memories

Now a four-piece: It's been six months since Zayn Malik quit the band to focus on being a 'normal 22-year-old', leaving Harry Styles, Liam Payne, Louis Tomlinson and Niall Horan (pictured) to carry on without him

Now a four-piece: It's been six months since Zayn Malik quit the band to focus on being a 'normal 22-year-old', leaving Harry Styles, Liam Payne, Louis Tomlinson and Niall Horan (pictured) to carry on without him

Big news: One Direction announced the launch of their fifth album on Tuesday, named Made In The UK

Big news: One Direction announced the launch of their fifth album on Tuesday, named Made In The UK

Surprise: They released the news of the pre-album launch with a video message which delighted their fans, with the full album being released globally on Friday November 13th

Surprise: They released the news of the pre-album launch with a video message which delighted their fans, with the full album being released globally on Friday November 13th

Making Midnight Memories: The boys were later seen heading to Mahiki after the London gig
Making Midnight Memories: The boys were later seen heading to Mahiki after the London gig

Making Midnight Memories: The boys were later seen heading to Mahiki after the London gig

Tired? Louis didn't seem to impressed after the late night outing in the British capital

Tired? Louis didn't seem to impressed after the late night outing in the British capital

So popular: It's a busy week for the popular band who will kick off the UK and EIRE leg of their On The Road Again Tour with six nights at London's O2 Arena

So popular: It's a busy week for the popular band who will kick off the UK and EIRE leg of their On The Road Again Tour with six nights at London's O2 Arena

Still on good terms: Ahead of the show, supporting act Little Mix performed a show-stopper of a set to hundreds of lucky fans at the Roundhouse in London's Camden

Still on good terms: Ahead of the show, supporting act Little Mix performed a show-stopper of a set to hundreds of lucky fans at the Roundhouse in London's Camden

Style stars: Perrie Edwards and Jade Thirlwall showed off their fashion credentials in their chic outfits

Style stars: Perrie Edwards and Jade Thirlwall showed off their fashion credentials in their chic outfits

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