Based on a new survey compiled by Reveal, Mail Online, and Express, we now know the top 15 things most husbands don't know about their wives. Guys, if you don't know these facts about your significant other, you'd better find out... before she finds out you don't!

1)  Her cell phone number.  54% of men don't know it.

2)  Her favorite song, 54%.

3)  Bra size, 39%.

4)  The specific date you met, 35%.

5)  Favorite perfume, 34%.

6)  Where she went to school, 28%.

7)  Her favorite clothing store, 24%.

8)  Shoe size, 23%.

9)  Dress size, 23%.

10)  Underwear size, 20%.

11)  Who she considers her best friend, 20%.

12)  Her allergies, 20%.

13)  Her Birthday, 12% (That's about one in eight, by the way.)

14)  Her natural hair color, 11%.

15)  Her official job title, 10%.

Oddly enough, two out of three men think their wives know all those facts about them!