So are they or aren't they back together? Tween star Justin Bieber has posted an Instagram picture of himself and ex-girlfriend Selena Gomez together, but promptly deleted it. The young stars were also spotted making out in Norway, giving rise to speculations that they have gotten back together.

The picture, which the 19-year-old Canadian pop singer posted on and promptly deleted from his Instagram account on Saturday, sees the two apparently cuddling while he looks at the camera and she leans closer to face him.

According to People magazine, the 20-year-old former Disney star travelled to Oslo to be with the "Boyfriend" crooner, who had a concert in the Norwegian capital to be with her ex. The pair then rekindled their relationship.

"They were holding hands, hugging and they kissed on the lips," a source told the magazine. "They looked really in love, like no fights ever happened before. It definitely looked like they were back together."

Selena was also Justin's mobile phone screensaver. In a paparazzi photo grabbed by eonline.com, he was spotted leaving a museum in Amsterdam while clutching his iPhone, and it looked like that his mobile phone had a picture of his ex-girlfriend as a screensaver.

The two split in November after two years of dating.

Just last month, Selena revealed to U.S. late night talk show host David Letterman that he had made Justin cry.

"The last time he was on, he and I got into a conversation and he said something and I said something, and then he said something and I said something, and I made him cry," the "Late Show with David Letterman" host said.

"Well, then, that makes two of us," she replied as she laughed along with him.