It's ok to stuff up - Even professionals stuff up
34 year old pop star Kelly Clarkson had a blooper in the studio when recording for her upcoming 8th studio album. Kelly who's 3-octave soprano vocal failed on her bigtime but she just laughed it off. Making bloopers or stuffing up can happen to anyone.
Kelly was on the floor laughing however posted the blooper on her social media saying "That time you think, Damn. I'm about to nail this... and then you don't".
IMAGE - By http://www.flickr.com/photos/vagueonthehow/ [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons