I tried dL KryZi's solution but couldn't seem to master it so I looked around and found something which was a lot easier for me personally.
Nina and Anna have their own special throw which isn't too hard to pull off. It doesn't matter who you start with on this either. Start by doing what is known as a 'quarter circle' in the video (going from crouching stance to standing while moving towards the opponent in the process) Then immediately press X+Y together to grab them, and the second they are grabbed press the TAG button. Simply do this three times and *bleep bloop.* Along with some lovely bone cracking sounds, courtesy of Nina and Anna's high heels.
Credit goes to Snakejl for the video.