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Miley Cyrus caused a stir when she performed with a drag queen on Saturday night.
The bride-to-be was enjoying a night out with friends when she serenaded entertainer Vicky Vox at the Roosevelt Hotel Beacher's Madhouse club in Hollywood.
Miley is known for being fun-loving and spontaneous, but her performance on stage was enough to surprise the crowd.
"She was in her usual happy mood and was very social and upbeat," a reveller told People.com. "She was very chatty with everyone at her table."
Singing loudly into the microphone, Miley performed Happy Birthday a cappella.
"It was ridiculous," a source told celebuzz.com. "She normally keeps to herself but she just jumped up, as there were like three birthday people on stage".
Miley dressed down for the occasion, wearing a sleeveless white T-shirt and denim shorts.
The star, who was without her fiancé Liam Hemsworth, partied until the club closed.
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