Justin Bieber serenades ex-girlfriend Selena Gomez with hit song Sorry

Could Selena Gomez and Justin Bieber be rekindling their romance? the couple sparked rumours after Bieber serenaded his ex at a hotel bar. Photo / Getty

Selena Gomez is "playing hard to get" with Justin Bieber.

The former couple have ignited rumours they may rekindle their romance after the What Do You Mean hitmaker was spotted serenading the 23-year-old beauty at a bar on Friday, but an insider claims she isn't giving into him that easily.

A source told PEOPLE magazine: "Justin was in a great mood and serenaded her. She was still a bit pouty and playing hard to get.

"They were friendly at the [hotel] bar but they didn't act like a couple."

Bieber took his seat at a piano in the Montage Hotel bar in Beverly Hills, California, where he was staying for the weekend, and played his hit Sorry and a rendition of My Girl for his ex.

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When you're having a drink at an empty hotel bar and @justinbieber appears out of nowhere and begins to sing on the piano. #LOSINGMYSHIT

A post shared by Lindsey Smith (@itslindssmith) on Nov 20, 2015 at 7:35pm PST

A fan recorded the songs on her phone and later posted them to Instagram, along with a photo of herself with the I'll Show You singer, supposedly taken by Gomez.

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Photo cred: @selenagomez. He asked to sit at our table to chat, so impressed by the kindness (and realness!) of this guy tonight. Now a #belieber

A post shared by Lindsey Smith (@itslindssmith) on Nov 20, 2015 at 9:13pm PST

The woman said she was having a drink at an "empty hotel bar" when the pair appeared out of nowhere.

She recalled the surreal experience of Bieber singing My Girl saying: "is this real? Pure magic."

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@justinbieber singing my girl to @selenagomez....is this real? Pure magic.

A post shared by Lindsey Smith (@itslindssmith) on Nov 20, 2015 at 9:17pm PST

They were later snapped stepping out, side by side, in LA.

The 21-year-old singer previously admitted the pair - who split in October last year - could get back together one day.

He said: "Maybe? We have a lot of history together and I am sure it could possibly happen.

"I think we are both just on our own journeys and figuring ourselves out and I think maybe once we figure ourselves out we can come back and make an awesome duo or she finds someone awesome and I'll find someone awesome. I just want her to be happy."

He went on to say she was someone, "I love dearly" and that would never change.

"I'm never going to stop loving her. I'm never going to stop checking in on her. I don't think if you end a relationship, you should end that, unless it was super toxic and you guys were hurting each other physically or mentally.

"We always respected each other and we still respect each other."

- Bang! Showbiz