Justin Bieber and Selena Gomez Kiss Backstage at Billboard Awards: See Taylor Swift’s Hilarious and Disgusted Reaction!

ABC

Well, well, well…this puts the "friendly" in "friendly exes."

Less than a week after Selena Gomez told a Boston radio station that she was single and a day after she and Justin Bieber were spotted getting cozy at a show in Las Vegas, the on-and-off couple shared a kiss backstage Sunday at the Billboard Music Awards.

Both had performed at the kudosfest, and—in a moment caught on video—both seemed more than happy to bump into each other later on, even as Gomez's BFF Taylor Swift , who was walking alongside the "Come & Get It" singer, unleashed a facial expression that seemed to convey exactly what she thought of the impromptu meetup.