Justin Bieber and Selena Gomez are back together, but they will be going head-to-head with their newest singles, "Slow Down" and "Heartbreaker."

Selena Gomez, who has just reportedly gotten back together with Justin Bieber, recently released a Youtube video with the audio track of her newest song, "Slow Down."  Justin Bieber has also announced that he will soon be releasing a new single called "Heartbreakers."

Selena Gomez plans to release her newest, and most likely last, album, "Stars Dance," on July 23. One of the tracks on the album, "Come and Get It," has already been released, and the music video has gone viral.

Justin Bieber, who has been taking a break from his "Believe" world tour, recently posted on instagram the album cover of his upcoming single, "Heartbreaker."

Justin Bieber posted the photo four separate times and wrote, "... Coming soon," "Tell a friend to tell a friend," "Don't tell me you're my.... #justinbeiber #heartbreaker," and "Heartbreaker #Justinbiebernewsingle."

It seems that Justin Bieber and Selena Gomez, although back together in their on and off relationship, will be fighting it out with album sales now that they both plan to release their songs at around the same time.

Selena Gomez's newest album is now available for pre-order, and Selena posted on her Twitter on June 3, saying, "Thank You so much for joining me for my chat. I hope you guys love this album as much as I do. #starsdancepreorder"

After "Come and Get It" became a big hit, Selena Gomez will be grabbing attention with her newest single, "Slow Down" as well.

Now that Justin Bieber and Selena Gomez will be album rivals for the summer, it is no telling who will win in album sales. The two singers are expected to be extremely successful with their newest singles.