WWW- Pop star Aaron Carter is engaged to a Playboy Playmate.

The 18-year-old singer – the brother of Backstreet Boys member Nick Carter – proposed to Kari Ann Peniche onstage in Las Vegas on Saturday, in front of an audience of 200 people.

Peniche gushed: “I’m very excited about it. Aaron is the most genuine person I know. He’s kind, loving, and I love him so much.”

The 22-year-old beauty confessed she was left absolutely stunned by Carter’s surprise declaration of love, made during the Playboy’s Hollywood Comedy Tour show at the Palms Casino Resort.

She added: “I don’t remember it happening. It was such a blur. I had no idea he was going to do this, but I’m glad he did.”

The happy couple plan to tie the knot in six months time.

However, the groom-to-be’s father Bob Carter says he has been left completely in the dark about the pending nuptials.

He is quoted by the Eonline! website as saying: “I heard he got married, then I heard he got engaged. I don’t have a clue.

“The couple just started dating. Even my daughters don’t know what’s going on.”

The bride-to-be was crowned Miss Teen USA in 2003, but she was later stripped of her title after posing nude for Playboy.

Carter will soon be seen in E! reality show ‘House of Carters’, with his brother Nick and three sisters.