GunValkyrie - Kelly Butt Shots

Here is a brief overview of GunValkyrie from Wikipedia:
GunValkyrie is an alternate history/science fiction video game developed by Smilebit and published by Sega for the Microsoft Xbox.

It takes place in 1906 when the British Empire rules all of Earth and several extrasolar colony worlds, powered by technology brought to the planet by Halley's Comet.

The divergence between the storyline and the real world is sometime in the 19th century. A scientist named Dr. Hebbel, referred to as "The Great Genius", discovers a wide range of scientific breakthroughs, including fusion and nuclear power, genetic engineering, computers, space travel and countless others. With these technologies the British Empire quickly conquers the Earth, and he is regarded as a god by everyone on Earth, even to the point where when he speaks out against Queen Victoria she is overthrown and he is chosen to lead. He institutes a variety of radical reforms, bringing humanity up to modern societal standards. He disappears shortly before the game begins.

The game itself follows members of an elite military force known as "Team Dolphin" (established 1887) as it tries to defend a colony world. The two playable characters are Kelly O'Lenmey, who was born in Ballymun, Ireland, daughter of Dr. Hebbel and Saburouta Mishima, grandson of one of the Samurai rebels who aided the British in conquering Japan. The story takes place on the planet of Tir na Nog, with the player facing off against thousands of alien creatures that resemble giant insects.

Kelly O'Lenmey shows her alien busting backside in this promotional wallpaper for the game.

The box cover reveals a great deal about Kelly's backside as well. It's always a good day when the box art features gratuitous booty.