Kirstie Alley Fell on “Dancing With The Stars”

KIRSTIE ALLEY is on "Dancing With Stars" this season, and she was doing pretty well.  That surprised some people, because of her weight.  (--GEORGE LOPEZ being one of them.)

And that 'surprise' made OTHER people mad, because it's not fair to ASSUME bigger ladies can't shake a leg.

Anyway, last night's episode will probably just make the debate more confusing.  Because about 12 seconds into the beginning of Kirstie's performance, her partner's leg gave out from under her . . . while he was trying to dip her.

Her partner Maksim Chmerkovskiy says his thigh "just gave out" . . . but it's not clear whether it happened because of Kirstie's weight.  He grimaced in pain a few times, and they finished the dance pretty well, with a better dip half a minute later.

Check out the video.

Via people.com