Really? Her butt doesn't look that big to me? http://farm3.static.flickr.com/2429/3731338681_5ac8ce6439.jpg :dunno:
Like most celebs her size has gone up and down over the years but I've always classified her butt as big. Which is good since I'm a big butt lover.
Some assorted shots from over the years...
http://img34.imagevenue.com/img.php?loc=loc87&image=0047128c_jenniferlovestuntawards089qv.jpg
http://img137.imagevenue.com/img.php?loc=loc135&image=0054741ir.jpg
http://img141.imagevenue.com/img.php?loc=loc244&image=80404jenniferlovehewitt06464qp.jpg
http://img147.imagevenue.com/img.php?loc=loc17&image=01258a1.jpg
In every one of those I'd call it big. Big and perfect.