Hey check it out ma! I'm learning English while studying Japanese. Thanks I didn't realize I didn't know that.
First off, this is a casual expression, so it is used in an ungrammatical context; second, こちら、こちら is not an expression, and the use of the polite form of これ assumes a more formal context, meaning that correct grammar would be expected anyway. This is, like what Waniou said, very casual, and it is commonly heard.