This picture has been shared with following captions:

• Aliens are real
• First contact
• Alien and presidents
• Aliens captured

This image is a fake. Original one below:

This is a photograph of William Thayer and Augusto Pinochet Ugarte. The photo was taken in Santiago, Chile. Author: Biblioteca del Congreso Nacional de Chile. Source: Wikipedia.

Special thanks to @UFOofInterest for posting these images in Twitter.