The Kardashians are the queens of multi-tasking, so it doesn't surprise us that during a photo shoot for their Christmas card last year, they also squeezed in an impromptu music video!

The Keeping Up With The Kardashians stars strut their stuff and sing along to "Lady Marmalade" like pros, and we are super impressed with Kris Jenner's dancing skills! Who knew the 56-year-old matriarch had moves?!

By now we all know Kourtney is expecting her second baby with beau Scott Disick, but at the time the vid was shot, the 32-year-old was still trying to conceal her pregnancy. We never would have guessed she had a baby on board with that bod!

Speaking of bodies, Khloe recently opened up to Glamour magazine about her momager's criticism of her weight. Click thru to see what she had to say...