Selena Gomez — Your Boyfriend Is a D-Bag … Is That a Bieber SLAM???

Selena Gomez might be a little bitter about her break-up with Justin Bieber … because SG and her hot friends posted a video of them shaking their asses to the song “Everybody Knows (Your Boyfriend is a Douchebag).”

In the video — posted on Youtube this week — Selena and pals perform a sexy-dance while mouthing lyrics like, “Your boyfriend is a douchebag and everybody knows … You know he”s got somebody on the side, girl … I really think it”s time girl, you quit defending him.”

Now, it”s not 100% Selena”s referring to JB — any one of those girls could have a d-bag for a boyfriend — but SG and Biebs did have a rocky split AND the two have been known to communicate through song during their on-again-off-again status changes.

You”ll recall JB previously sang “Cry Me a River” during one break. Selena later responded with, also, “Cry Me a River.”

Hey, It”s hard to be original when you”re sad.