Looks like the stress of "Dancing with the Stars" is catching up with Bristol Palin.

The reality TV star and partner Mark Ballas got into it on last night's episode of the ABC show, after Mark missed a rehearsal and then criticized their performance from last week.

"I know you're bummed that you don't have Sabrina [Bryan] or Shawn [Johnson]," Palin said after Ballas asked what was wrong with her.

"I've been on the show 11 seasons now and I don't always get a Shawn or a Sabrina," Mark responded. "I've never not once stuck up for you or been by your side every step of the way."

Palin then started getting emotional and stormed out of rehearsals ... leaving Mark to explain "What the f**k am I meant to do now?"

Check out her huffy exit above and the performance below.

So, did the fight affect their live show? Yes and no. The two scored a 22.5/30 ... and while it'd be a pretty low score for any other couple (and the lowest of the night), it was actually their highest yet.

But with a double elimination looming, it could be the last we see of Palin on the show.

As for who's safe tonight, we can safely assume Derek Hough and Shawn Johnson are -- after they performed what judge Bruno Tonioli called "the best dance I've seen in 15 seasons."

Check it out below:

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