They're human beings and sometimes the pressure gets to them. Last week was rough for Bristol Palin and Mark Ballas on Dancing With the Stars Season 15 All-Stars, and they showed the strain during a Week 3 rehearsals argument that was just posted to People.com. It's not a fight fight like Kate Gosselin and Tony Dovolani on Season 10, but it's tense. And sad. Bristol quietly says she knows......
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