Kim Kardashian Celebrates 40th Birthday with Sexy Bikini photo

by Daryl Nelson

Kim Kardashian turned 40 on Wednesday Oct. 21, and she's still thirst-trapping at a pretty high level.

Proof of this can be found in a new photo that she posted to Instagram yesterday that shows her in a skimpy olive colored bikini.

"This is 40!" wrote Kim, who's marriage to Kanye West has faced a lot of challenges this year.

How do you think Kim looks?