MMA Weekly breaks the news:

The first change to the upcoming UFC 126 card has taken place with Sam Stout dropping out of the his proposed encounter with Paul Kelly in Las Vegas. While the specific nature of the injury has yet to be revealed, it has come to light that Donald "Cowboy" Cerrone will be stepping into his place against the Brit.

Donald Cerrone is taking a bit of a gamble here, making his UFC debut on short notice.  Good news for the Cowboy is that he matches up well against Kelly, and should be a very fun fight, which is right up Cerrone's alley.  He's coming off a quick victory over Chris Hordecki at WEC 53, where he took very little damage, and finished the fight in the second round with a triangle choke. 

Photo via Dave Mandel, for Sherdog