Stars Comment on Social Media Before Tonight's Presidential Debate

From Mark Cuban to Katie Perry to Kirstie Alley, a slew of celebrities weigh in.

"I don't think he's got the skill set," he said about Trump. "Let's put it this way, if he came on 'Shark Tank,' I wouldn't make the investment. I just don't see him as being capable in the least bit."

Trump quickly responded to the news by tweeting that he was considering inviting Gennifer Flowers, the variety show performer who famously had an affair with Bill Clinton before he became president.

Although Trump's campaign manager told ABC News' George Stephanopoulos that Trump did not actually invite Flowers, it seems she was willing to accept the invitation.

Meanwhile, other celebrities are gearing up to watch the first debate between the two candidates. Here's what they are saying on social media: