Back together: Justin Bieber and Selena Gomez selfie has Gomez fans howling

POP sweetheart Selena Gomez is back in the arms of Justin Bieber - and fans are dismayed that the good-girl role model keeps coming back to the trouble-making twerp.

In an intimate new selfie, Gomez, 21, is shown hugging Bieber, 19, from behind and gazing at him lovingly as he looks directly into the lens, the New York Post reports.

"Love the way you look at me," Bieber posted, along with the photo, on his Instagram account on Saturday moing.

But it's about time the wholesome former Disney actress - who has for years put up with the rocky on-again-off-again relationship - call it quits with the bad boy, who was recently caught visiting a Brazilian brothel, fans said.

"Selena Gomez is too good for Justin Bieber, she needs to move on!" tweeted @actionnjackson9.

Another fan added, "[Smart] people get back with dumb boyfriends, and Selena Gomez and Biebs are no exception."

The celebrity lovebirds broke up in November 2012, but the two have been seen out together in Califoia in the past month.

Gomez - who’s hit song Come & Get It topped the charts last year - has steered clear of scandal. She has maintained a level-headed image even in the spotlight.

Bieber, on the other hand, racked up a lengthy list of bad behavior - including visiting a brothel in Rio in November and abandoning a monkey he brought on tour in Germany. And his bodyguards allegedly beat up a paparazzo.

He was also caught smoking weed, driving more than 161km/h and peeing in a mop bucket at a New York restaurant.

When Gomez ended the relationship in 2012, Bieber was photographed crying.

Biebs has since had plenty of flings, some of which were captured in photos posted by gals in Brazil and Puerto Rico, where he recently toured.

Gomez and Bieber were spotted in Calabasas, Califoia, riding Segway scooters last week.

They were also photographed snuggling courtside at a Lakers basketball game in April.

"Looks like the Biebz uses Selena as a booty call cause they stay on and off," @TylerHensley_ 13h tweeted.