Selena Gomez appears to be as mesmerized by American Idol judge Nicki Minaj's backside as the rest of the world is.

Selena was asked by Radio 1 about Nicki's sexy performance at last weekend's 2013 Billboard Music Awards, which involved Nicki giving Lil Wayne an onstage lap dance.

“Her a** is very big," Selena said succinctly. No argument here.

Selena said that the lap dance was "crazy" and also praised Nicki's dance ability, pointing out, "She's got that killer swag."

Are you surprised to hear the normally demure Selena comment on Nicki's booty? We sure are, but maybe this just part of Selena's more mature persona.

And it's no doubt that Selena's on-again, off-again boyfriend Justin Bieber is a fan of Nicki's rear as well.

"I like butts  I'm attracted to them," he said in an interview last year. "Do I have a favorite? Nicki Minaj has got a nice one." Easy there, tiger.

Justin and Nicki also collaborated on the hit, "Beauty and a Beat." 

Nicki's music career is going stronger than ever, as she won three Billboard Awards over the weekend, including Top Rap Artist.

Her judging career may be in jeopardy, however, as Nicki is rumored to be leaving Idol before next season rolls around.

In other words, she may have to find a new place to put her butt besides the Idol judge chair. 

Source: Radio 1 via Entertainmentwise