Wrong! (In more ways than one!)
A frighteningly large percentage of individuals fail to understand the difference between the words "you're" and "your". Here is a quick and dirty crash course on this common usage problem.
- Understand the proper      usage of the word you're. It is a contraction, or a combination of the words you      and are. Other examples of contractions include doesn't, they're,      and can't. 
- "You're a       good friend." ("YOU ARE a good       friend.")
- "I don't know       what you're talking about." ("I don't know what YOU ARE       talking about.")
- Understand the proper      usage of the word your. The word your is the possessive form of you,      referring to something that a person has, or something that belongs to the      person in discussion [or, the person you are talking to]. 
- "Is your       stomach growling?"
- "Your       book is on the table."
- Take a look at some      examples.      Each of the following examples shows an incorrect use of your/you're, and      why it is incorrect. 
- "I can't read you'rehandwriting."
- Incorrect because        the contraction for "you are" is being used as the possessive        form of you. It should be replaced with "your". Would "I        can't read you are handwriting" make sense?
- "If yourhungry, then you should probably eat something."
- Incorrect because        there is no possession in question. This should be replaced with you're,        or you are. Would "If my hungry..." make sense?
- "Yourvery smart."
- Again, incorrect.        The "very smart" does not belong to the person that you are        talking to—this doesn't make any sense. Replace your with you're,        or you are.
- Keep in mind that the      word your will never be followed by the words the, a,      or an.
- Remember that the word      your will usually not be followed by an adjective [a word that describes],      when that adjective is describing the person that you are talking to. In      other words, saying "Your very kind" or "Your stupid"      will almost never be correct. "Your very kind" or "your      stupid" would be correct if they were describing a noun. 
- "Your nice       son brought me my coat." 
- Here, your nice        is correct because nice is describing the person's son.
- Remember that you're      is actually a combination of two words and thus fulfills two very      important roles in a sentence or clause. Because it includes both a      pronoun and a verb, you're will always be the subject and at least      part of the verb of any clause in which it appears.
- Try replacing “your”      or “you’re” with “you are” if you are unsure which to use. If the sentence      makes sense, use “you’re.” Remember that only “you’re” is a contraction,      and it omits the letter “a.” The apostrophe in “you’re” signifies the      omission of the letter “a.” If the sentence does not make sense, you will      know to use “your.”
- For example: 
- “You’re a good       writer!” → “You are a       good writer!”
 “You are” makes sense in this sentence, so you can use “you’re.”
- ”I cannot read you're       handwriting.” → "I cannot read you       are handwriting."
 “You are” does not make sense in this sentence, so you should use “your.”
- Try not to think that      proper writing is strictly "academic". It makes you appear      more intelligent. More      importantly, it eliminates the risk of bad habits "slipping out"      in situations in which it is critical to convey properness, such as      writing a college essay or a job      résumé.
- Just remember      "You're not spelling your words correctly," and it all falls      into place.
- While acceptable in text messaging, the increasingly popular "ur" should never be used in writing.