This is an updated solution for Bootstrap 3 (should work for older versions though) that uses CSS/LESS only:
http://jsfiddle.net/silb3r/0srp42pb/11/
You set the font-size to 0 on the row (otherwise you’ll end up with a pesky space between columns), then remove the column floats, set display to inline-block, re-set their font-size, and then vertical-align can be set to anything you need.
No jQuery required.