Justin Bieber has been flirting with a mysterious girl on Instagram amid rumors that his on-again, off-again girlfriend Selena Gomez is dating One Direction’s Niall Horan. According to several fans, the "Sorry" singer may be aiming at making Gomez jealous.

The 21-year-old singer drew attention at Cindy Kimberly after posting a photo of her to his Instagram account with the caption, “Omg who is this!!” alongside a selfie of the girl. Bieber urged his 47 million Instagram followers Monday to help identify the woman.

A source told Hollywood Life that Bieber was “hurt” over the dating rumors of his “friend” Horan and Gomez. Horan and Gomez had a PDA-filled Friday night last week at actress Jenna Dewan-Tatum’s 35th birthday party in Los Angeles. The two were reportedly seen “dancing close together all night, kissing on the lips and hugging a lot.”

Despite Gomez and Horan's dating rumors, Bieber posted a throwback photo of himself with "The Heart Wants What It Wants" singer. This is the second time within a week that Bieber shared a throwback photo of his former girlfriend. While he initially did not caption the first image he posted, he later added one after “Jelena Is Back” began trending on Twitter.

Gomez and Bieber sparked rumors of reconciliation last month after the two were spotted spending a romantic evening at the Montage Beverly Hills, where Bieber sang “My Girl” to former.