Guest Editor and Birchbox co-founder Katia Beauchamp has shared with us the beauty products she can't live without, her travel beauty bag, and her closet essentials, and today she's sharing with one lucky StyleList reader her very own creation, Birchbox!

Today only, November 15th, we're giving away a 6-month subscription to Birchbox for Birchbox co-founder Katia Beauchamp's Guest Editorship!

It's easy to enter! All you have to do is follow @StyleList and @Birchbox on Twitter and retweet 1 of 7 promotional tweets for a chance to win!

Full rules:

• Open to legal residents of 50 United States and the District of Columbia who are 18 and older.
• To enter, retweet (true retweet, quoted retweets will not be counted) 1 of our 7 tweets stating "RETWEET for a chance to WIN a 6-month @Birchbox subscription! Rules: [LINK] #StyleListSelects".
• Contest begins on November 15th at 12:01 AM Eastern Time and ends on November 15th at 11:59 PM Eastern Time.
• You may enter up to 7 times.
• 1 winner will be selected in a random drawing at the end of the contest.
• 1 winner will win one six-month Birchbox subscription with an approximate retail value of $60.00.
Click here for complete Official Rules