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Justin Bieber, Selena Gomez

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Justin Bieber, what do you mean?

The 21-year-old pop star posted on his Instagram page late on Saturday a 2012 photo of himself walking and holding hands with then-girlfriend Selena Gomez after they attended the Los Angeles premiere of her film Hotel Transylvania. His shared the pic a day after the 23-year-old actress and singer was spotted packing on the PDA with One Direction star Niall Horan, 22.

"Crazy throwback," Bieber wrote.

The singer had also posted a throwback photo of the two last week.

Bieber and Gomez had dated on and off for three years before they broke up in 2014 and recently reunited for several hours in late November, during which Bieber serenaded her at a hotel bar. They have not commented on the status of their relationship.

Gomez and Horan have also not commented about their PDA session, which took place on Friday night at Jenna Dewan Tatum's 35th birthday party at a Los Angeles nightclub. The two had also both performed at 102.7 KIIS FM's 2015 Jingle Ball earlier in the day. Horan stayed late to watch Gomez's set and the pair left the venue together at the same time.