Wash your mouth out, Miley! Miley Cyrus managed to cause yet another stir during the Sunday, May 18, Billboard Music Awards in Las Vegas, by dropping the "S" word, live on national TV.

The singer surprised with a somewhat tame performance of The Beatles’ mellow classic "Lucy In The Sky With Diamonds," which she performed alongside The Flaming Lips rocker Wayne Coyne on a live-stream from the UK where she is currently touring.

But Cyrus, 21, still managed to create havoc at the annual awards show, by cursing as she accepted her gongs for Top Streaming Artist and Top Streaming Song.

Linking in with the crowd via satellite link from Manchester, England, the "Wrecking Ball" singer looked delighted to have won the categories.

"Thank you guys so much for making me the top streaming artist of the entire year," Cyrus said. "I have to of course thank all of my fans as the reason I'm on this amazing tour right now."

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But then, in controversial form, the singer couldn't help but let out a swear word. "Thank you to everyone for making this s--t possible. Oops, I'm on ABC, sorry!”

Click on the video above to watch her acceptance!