Gravity has really taken its toll on that backside.
Let this be a lesson to all of you…an overstuffed backside can only battle gravity for so long.
Kim Kardashian and sister Kourtney were spotted hanging in Mexico in their bikinis, soaking up the sun and waves. Kim looked…well, see for yourself. On the other hand, Kourtney look incredible. Is she aging backwards?
Click through for all the angles: