Justin Bieber's BFF DUMPED By Ashley Benson For James Franco!

Ashley Benson has officially made enemies with Hollywood's youngest power couple!

According to reports, Selena Gomez and Justin Bieber are LIVID with the Pretty Little Liars star for dumping their best pal, Ryan Good, after hooking up with her Spring Breakers co-star James Franco.

Selena is especially hurt by Ashley's two-timing, because she helped Ash score the Spring Breakers role with Franco!

A Selentia insider reveals:

"After Emma Roberts turned down the role because she didn't want to gain weight for it, Ashley practically begged Selena to get her in front of producers for the part. She did, because she thought they were all friends, but it was clear early on that Ashley had something going on with James.

Selena feels used and kind of punched in the face seeing as though she got Ashley the role and Ashley just used the opportunity to break her friend's heart."

What's worse, our source suggests that Ashley never officially called off her romance with Ryan! Yiiiiiikes!

We're told:

"Once the shoot wrapped, Ashley told Ryan they needed to 'slow down' and then booked a flight to New York City to go see James' art gallery showing. Selena is pissed off that she went out of her way to vouch for Ashley, only to have her dump Ryan."

We don't blame her!

Ash may have a new lover and a great new movie role, HOWEVES she lost a friend in Selena aaaaand The Biebs forever.

Those are two youngsters we would NOT want to f*ck with!

Hope this relationship with James is worth is gurl! It may have cost you a LOT more than you realize!