Mariah Carey has her Little Sheep. Justin Bieber has his Beliebers and Lady Gaga has her Little Monsters.

Lady Gaga's Little Monsters

A fan of U.S. singer Lady Gaga writes her name on her skin as she waits for her performance at the gay pride parade concert in downtown Rome. Stefano Rellandini/Reuters

Lady Gaga's Little Monsters

Lady Gaga fan blows kiss to camera as she waits in line outside album-signing event for Lady Gaga's new release "Born This Way" in New York City. Jessica Rinaldi/Reuters

Lady Gaga's Little Monsters

Katherine Lloyd waits in line at an album-signing event for Lady Gaga's new release "Born This Way" in New York City. Jessica Rinaldi/Reuters

Lady Gaga's Little Monsters

Fan waits for Lady Gaga's arrival at Narita International Airport. Toru Hanai/Reuters

Lady Gaga's Little Monsters

Lady Gaga fans pose for a photo as they wait for her arrival at Narita International Airport. Toru Hanai/Reuters

Lady Gaga's Little Monsters

Fans of U.S. singer Lady Gaga pose as they wait for her arrival beside the red carpet before the MTV Video Music Aid Japan in Chiba. Issei Kato/Reuters

Lady Gaga's Little Monsters

Fans of U.S. singer Lady Gaga react after she did not appear on the red carpet before the MTV Video Music Aid Japan in Chiba. Issei Kato/Reuters

Lady Gaga's Little Monsters

A fan of U.S. singer Lady Gaga poses for a photograph before a welcoming ceremony in central Taiwan. Nicky Loh/Reuters

Lady Gaga's Little Monsters

Fans dressed as U.S. singer Lady Gaga, pose for photographs as they wait for her concert in front of the Olympic stadium in Seoul. Kim Hong-Ji/Reuters

Lady Gaga's Little Monsters

Fans wearing the traditional Korean Hanbok wait for U.S. singer Lady Gaga's concert in front of the Olympic stadium in Seou. KIM HONG-JI/REUTERS

Lady Gaga's Little Monsters

Fans dressed as U.S. singer Lady Gaga, pose for photographs as they wait for her concert in front of the Olympic stadium in Seoul. Kim Hong-Ji/Reuters

Lady Gaga's Little Monsters

A fan dressed as U.S. singer Lady Gaga, poses for photographs while waiting for her concert in front of the Olympic stadium in Seoul. Kim Hong-Ji/Reuters

Lady Gaga's Little Monsters

Fans dressed as U.S. singer Lady Gaga, pose for photographs as they wait for her concert in front of the Olympic stadium in Seoul. Kim Hong-Ji/Reuters

Lady Gaga's Little Monsters

A fan dressed as U.S. singer Lady Gaga, poses for photographs while waiting for her concert in front of the Olympic stadium in Seoul. Kim Hong-Ji/Reuters

Lady Gaga's Little Monsters

Fans gesture as they wait for U.S. singer Lady Gaga's concert in front of the Olympic stadium in Seoul. Kim Hong-Ji/Reuters

Lady Gaga's Little Monsters

A Lady Gaga fan poses for a photo as she waits for the U.S. singer's arrival at Narita international airport in Narita, east of Tokyo. Toru Hanai/Reuters

Lady Gaga's Little Monsters

A Lady Gaga fan poses for a photo as she waits for the U.S. singer's arrival at Narita international airport in Narita, east of Tokyo. Toru Hanai/Reuters

Lady Gaga's Little Monsters

A Lady Gaga fan waits for the U.S. singer's arrival at Narita international airport in Narita, east of Tokyo. Toru Hanai/Reuters

Lady Gaga's Little Monsters

Fans of Lady Gaga pose for a photo as they await the U.S. singer's arrival in Manila. Cheryl Ravelo/Reuters

Lady Gaga's Little Monsters

Fans of singer Lady Gaga pose in their outfits before watching the first day concert of Lady Gaga in Manila. Romeo Ranoco/Reuters

Lady Gaga's Little Monsters

Fans of Lady Gaga show their support for the singer infront of anti-riot police before attending the first day of her concert in Manila. Romeo Ranoco/Reuters

Lady Gaga's Little Monsters

Fans of Lady Gaga queue during the first day of the singer's concert in Manila. Romeo Ranoco/Reuters

Lady Gaga's Little Monsters

A Lady Gaga fan poses for a photo as she waits for the U.S. singer's arrival at Don Muang Airport in Bangkok. Sukree Sukplang/Reuters

Lady Gaga's Little Monsters

A Lady Gaga fan poses for a photo as she waits for the U.S. singer's arrival at Don Muang Airport in Bangkok. Sukree Sukplang/Reuters

Lady Gaga's Little Monsters

Fans of U.S. singer Lady Gaga wait for her arrival at Changi Airport in Singapore. Tim Chong/Reuters

Lady Gaga's Little Monsters

Dave Singh, a fan of U.S. singer Lady Gaga, poses for photos before her Born This Way Ball concert in Singapore. Tim Chong/Reuters

Lady Gaga's Little Monsters

Fans of U.S. singer Lady Gaga stand in line as they wait to enter the venue for her Born This Way Ball concert in Singapore. Tim Chong/Reuters

Lady Gaga's Little Monsters

A fan of U.S. singer Lady Gaga waits for her arrival in Taipei. Stringer Taiwan/Reuters

Lady Gaga's Little Monsters

A wax figure of US singer Lady Gaga surrounded by fans after its unveiling at Madame Tussauds museum in New York. Mike Segar/Reuters