Justin Bieber and Selena Gomez are allegedly back together after they were spotted partying in Bootsy Bellows in West Hollywood to celebrate the birthday of their friend. The sighting came days after the "Baby" singer's "Unconditional Love" photo on Instagram.

On Monday night, the two appeared to be quite cozy with each other which fueled rumors that Justin Bieber and Selena Gomez are back together this 2014, MailOnline reported.

In a series of snaps posted on the site, the 21-year-old actress was standing close behind Justin Bieber with a smile plastered on her face. Justin Bieber, meanwhile, was "acting the diva" as he wore dark aviators in the "dimly-lit club."

The Canadian singer was also wearing a blue fedora and gold chain around his neck, the website added.

The two spent the day together as she clung to Justin Bieber while riding his Can-Am Spyder three-wheeler along the beach. Selena Gomez just returned from a Nepal trip to raise awareness for kids in trouble as part of her advocacy for Unicef.

In a report by E! News, the troubled singer took down the Instagram photo which proved that Justin Bieber and Selena Gomez are back together. The photo showed the "Come & Get It" singer cradling the Biebs in her arms as she stared at the camera.

Although Justin Bieber's face could not be seen, "it's clear that it's him because of his latest ink on his neck," said E!

"One source tells E! News that they aren't aware of Justin and Selena  being back together, while Bieber's rep declined to comment on his client's personal life," it said.

The two shared a tumultuous relationship as they seemed to be splitting then making up every month, although HollywoodLife said: "Selena always feels that she should protect Justin, and as long as he continues to get in trouble, she will continue to feel bad for him and want to do something to help," the source told the website.