Kim Kardashian Cries on a Roller Coaster

Kim Kardashian ditched her cowboy-worthy companion from last week for one of the more thrilling attractions at Six Flags Magic Mountain.

Perhaps a little too thrilling – judging by the pictures.

Braving the ride with boyfriend Kanye West and sisters Kendall and Kylie Jenner, Kardashian can't contain her fright in a picture she Tweeted Tuesday from their Santa Clarita, Calif., adventures.

"Magic Mountain fun today!" wrote the reality star, 31. "Kendall screaming, Kanye laughing & me crying!" (For the full effect of what she described as her "ugly infamous cry face," she Tweeted a close-up snapshot, too.)

"Mannnn my crying face!" she added. "I officially am afraid of heights now."