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OTRC: Lady Gaga surprises drag queen impersonator in Louisville - Watch

Lady Gaga appears in an undated promotional photo from her official website. (Photo courtesy of ladygaga.com)

Lady Gaga surprised some fans, and a few drag queens at a Louisville, Kentucky club when she joined a Lady Gaga impersonator on stage on Saturday.

After performing a sold out show at the KFC Yum! Center in Louisville on Saturday night, the 24-year-old singer made an impromptu appearance at the club at around 1 a.m., according to MTV.

The singer then joined her look-a-like on stage to sing "Born This Way," clad in fishnet stockings and a black leotard as the crowd went crazy.

Jason Wetsbay, the marketing director of the Louisville club, tells The Courier-Journal, "She stopped by every one of the dressing rooms and took photos with them. She was so sweet and humble."

Meanwhile, Lady Gaga announced on her Twitter page that her custom designed "Pray for Japan" bracelets have raised "a quarter of a million dollars for Japan Relief," in just 48 hours.

Gaga has designed a "We Pray For Japan" wristband, with all proceeds going directly to Japan for relief efforts following the 8.9-magnitude earthquake.

The red and white wristband says, "We Pray for Japan," written in both English and Japanese. The "Born This Way" pop star took to her Twitter account to alert her eight million followers.

"I Designed a Japan Prayer Bracelet," Gaga wrote on her Twitter account. "Buy It/Donate here and ALL proceeds will go to Tsunami Relief Efforts. Go Monsters."

The bracelet is available for pre-order on Lady Gaga's official website, LadyGaga.com, and will ship around March, 25, 2011. Buyers are encouraged to add any additional donations to the $5 charge.

Check out a video of Lady Gaga's surprise performance below

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