New Couple Alert: Stephanie Pratt & Asher Roth

Spencer Pratt is not gonna like this.

No really, he hates Asher Roth's music.

Stephanie Pratt and the up-and-coming rapper, who Spencer dissed in a recent interview, are now romantically involved, according to a report in Life & Style.

Asher Roth, whose debut single "I Love College" has become a viral hit, got hot and heavy with Stephanie in Vegas. The two reportedly partied until 5 a.m.

“He had a really good night and hasn’t stopped talking about her,” a friend of Asher Roth tells the celebrity news mag. “He’ll ask Stephanie out again soon.”

This new romance won’t go over well with Stephanie's older brother, who’s launching himself into the music business as the self-proclaimed future of hip-hop.

In doing so, he's had some harsh words for Asher Roth.

“I believe my music is more convincing and relevant,” Spencer Pratt told Complex. “To me, he’s garbage. That’s why I’m a new rapper - I have substance.”

The Hills star already made his feelings about the couple known, Tweeting that he can’t believe his sister “is hanging out with that nerd Asher Roth!”

Can't wait for yet another inevitable Speidi meltdown.

Asher Roth is dating Stephanie Pratt. Sucks for him.