nreed060511_01_X17230WM.jpgActress Nikki Reed and American Idol's Paul McDonald have only known each other for less than four months, but the two are already planning to get hitched, according to E! News.

The couple walked the red carpet at Sunday's 2011 MTV Movie awards ... and the Twilight hottie couldn't help but flash her engagement ring. When asked about Paul, she tells E!, "He's the one. He's the one."

AI's Paul McDonald, who secured a place in the show's Top 8, is reportedly writing tracks in honor of his new fiancee. Nikki adds, "He says he's going to release a Nikki Reed EP."

Let's hope Paul's upcoming album and their relationship is a success!

See more of the newly engaged couple ... after the jump.