The "Wrecking Ball" singer, in typical Miley fashion, briefly stole Brit's show by stealing not one, but two of her backup dancers for a serious snog session.
At the tail end of one of Spears' numbers, Cyrus persuaded the two beautiful brunettes in ripped-up black leotards to jump down from the stage for a sultry twerk session. Then Milez went in for the kill, grabbing one of the dancer's necks and seriously getting down.
(We'll give you a moment now to collect yourself.)
But Cyrus wasn't the only chart topper gracing Ms. Spears' show. The likes of Selena Gomez, Katy Perry and Adam Lambert were rocking to all the Brit hits they cut their popstar teeth on in the front row.
But no one else (obvs!) was able to leave their mark on Britney's big day quite like Miley did.
And in case you are wondering whether Brit Brit was peeved about the Miley upstaging, she wrote this after the show:
C'mon y'all, Britney knows by now that she's just being Miley.
For (lots!) more Miley, check out Fuse's collection of the 15 defining moments from Miley Cyrus' Insane 2013.