Valeria Valeryevna Lukyanova (Ukrainian: Валерія Валеріївна Лук'янова; Russian: Валерия Валерьевна Лукьянова; born 1985) is a Ukrainian model best known for her resemblance to a Barbie doll. She currently has property in Mexico and lives in Moscow. To enhance the Barbie effect Lukyanova uses makeup and contact lenses over her naturally green/gray/blue eyes. She has stated that she has had breast implants, but that the rest of her body is natural and slender due to daily gym workouts and a particular diet.

Lukyanova was born 1985, in Tiraspol, in what was then part of Moldavian SSR in the Soviet Union. She is of Russian origin. Her mother, Irina, worked within the military sector; her father was a construction worker who also was a part-time disc jockey. Lukyanova lived in Odesa, Ukraine from age 16 until 2014, when she moved to Moscow.

In 2007, Lukyanova won the worldwide beauty contest "Miss Diamond Crown of the World". The beauty pageant was open to any woman, had about 300 contestants, and had no rule forbidding plastic surgery or body modification. She subsequently had multiple photo sessions and interviews published in Russian media, including erotic photos. Lukyanova developed a worldwide following for her Barbie doll-like appearance after she posted photos and videos of herself on the web. The first notable coverage of her from outside Russia was on the Jezebel blog, followed by a photo session in V by Sebastian Faena. The media described her as being like a living Barbie doll.

There has been scepticism of Lukyanova. ABC News suggested that Lukyanova was a hoax aided by image editing software. Diane Levin regarded Lukyanova as an example of the negative effects of media objectification. To counter the image editing accusations, Lukyanova posted videos on YouTube and appeared on Russia-1 and Channel One Russia TV channels. Lukyanova admitted to having breast augmentation but no other plastic surgery, and denies that she had ribs removed to make her waist smaller. Lukyanova blamed people unconnected to her for altering photos of her younger self in a malicious attempt to imply she had received body modifications.

In 2013, Lukyanova was the subject of an episode of Vice's My Life Online documentary series entitled Space Barbie. In 2013 she participated in the documentary movie The Phase, which was released on YouTube in 7 languages.

In 2015, Lukyanova participated in Dosso Dossi's fashion show as a model.

Lukyanova is an instructor at the School of Out-of-Body Travel, described as "an international school in which our instructors show students how to leave their physical body and travel in their spiritual body." Her spiritual name is Amatue.

She is a composer, an opera singer, and has recorded two albums of new-age music, Sun in the Eyes and 2013 using the name Amatue. She wrote and self-published a book about her astral trips, Astral Travel Amatue, which she made available in 2012 as an RTF file to download for free from her website.