Aaron Carter Breaks Engagement

Pop singer Aaron Carter has broken off his engagement to his older brother's ex.

The 18-year-old called off his engagement to 22-year-old actress Kari Ann Peniche just a week after he proposed onstage in Las Vegas, Us Weekly reported on its Web site Sunday.

Peniche is an ex-girlfriend of Carter's older brother, Backstreet Boys singer Nick Carter. She's also a former Miss Teen USA and former Playboy playmate.

"I got caught up in the moment and proposed," the younger Carter told the magazine. "I then realized it was a hasty thing to do and I am not ready for marriage quite yet."

Both brothers will appear in the upcoming reality series "House of Carters" on the E! network.