IPhone 4S YouTube app disappeared?

YouTube updated the other day and when it finished updating it disappeared. If I do a spotlight search for YouTube on my phone nothing comes up, but if I go to the App Store it says open instead of download, like it exists on my phone. It won't open either when I push open. Any suggestions?

Added (1). I'm running the latest ios, I've restarted my phone a couple times, and I can't reinstall because in the App Store it says open like it's already on my phone.

Reinstall

Try restarting your iPhone by holding the home button and power button at the same time until it turns off. Then turn it back on and see if that helped any. Don't worry you will still have all your apps etc that you had on there before. Nothing will be lost.

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