LADY GAGA UPSTAGE MILEY AT THE 2013 AMERICAN MUSIC AWARDS

If there's any star these days who's difficult to steal the spotlight from — it's the tongue-wagging, twerking, eyebrow-morphing Miley Cyrus. However at the 2013 American Music Awards, it was another celeb's turn to grab back center stage; making such a stunning entrance  that Cyrus herself admitted defeat.

That would be Lady Gaga, of course, who pre-Miley was accostumed to owning these events. Tonight, the singer arrived on scene poised on a Trojan horse (powered by two hidden humans inside), dressed in a Grecian gown...and right smack in the middle of Cyrus's red-carpet interview.

Cyrus put on a wry face for the massive upstage. "You can stop interviewing me now," she deadpanned. "I'm so boring, I'm back to normal."

Indeed, Cyrus was dressed in an uncharacteristically low-key outfit — a simple while pantsuit accented with tasteful hair and makeup — and was giving benign commentary on the special performance she had planned for the awards show in honor of her 21st birthday, which she celebrated Saturday.

Speaking like a jaded veteran of red carpet wars, Cyrus was impressively humorous about her rival's splash. "What a [expletive] scene stealer," Cyrus noted dryly. "Next time I'm coming in on a dragon."

For those wondering about Gaga's horse, the superstar later explained that she wanted to channel a disco vibe; using '70s icon Bianca Jagger — who famously arrived for her birthday party at Studio 54 in 1977 mounted on a (real) white steed — for insipration.

The 2013 American Music Awards were held at Nokia Theatre L.A. Live on November 24, 2013 in Los Angeles, California.