My bf and I got home from dinner tonight, expecting to see Ella looking at us excitedly from her x-pen.  But instead of being in her locked pen, Ella greeted me at the door 

  I know that her older sister is quite the climber, but we didn't think we'd have to worry about that for a while--Ella is only 6 months old (today!).  Thankfully, she didn't leave us any messes (that we've found). 
So, I guess I'll be looking for a taller x-pen.  Or at least one that isn't so easy to climb.