Miley Cyrus suffered a momentary wardrobe malfunction in which she revealed her boobs at an iHeartRadio event in Miami on June 28.

The 20-year-old surprised iHeartRadio Ultimate Pool Party grand prize winner Natalie Bergen and four of her friends to an exclusive listening party in a private penthouse, according to iHeartRadio.com. Cyrus welcomed the winners to a room decorated with a big balloon banner spelling out "Twerk," giant blow-up rubber duckies, balloon palm trees and fake money scattered all over the bed.

See photos here of Cyrus with Bergen and her friends at the private listening party.

The singer played the girls a song off her new album. Afterward, while they were all talking about the song, Cyrus's floral bra top came undone. Luckily, one of Bergen's friends was able to fasten it quickly before she was completely topless.

See a photo here of the almost wardrobe malfunction.

Cyrus laughed off the incident by giving Bergen a poster signed: "Natalie! Twerk Bitch/Love, Miley/PS Sorry about da titties!"

On June 29, the singer hosted the IHeartRadio pool party presented by Visit Florida at Fontainebleau's BleauLive in Miami Beach. Performers that night included KeSha, LL Cool J, Jason Derulo, Icona Pop, Afrojack and Pitbull. Cyrus wore a black choker-neck mini vintage Versace dress and red nail polish. She paired the look with black, pointy pumps, minimal jewelry but her engagement ring in full view. See photos here.

She was spotted at the event with her mother, Tish Cyrus. Miley's fiance, Liam Hemsworth, did not attend.

Cyrus tweeted on June 29, "Miami. You have my ❤"

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Miley Cyrus