Olivia Munn developed trichotillomania over a paparazzi shot

Speaking on the Armchair Expert with Dax Shepard podcast, she said: "There's a sensation. It's probably not even real, but I'll feel like, 'Oh, this eyelash feels like it's gonna come out,' even though it's not.

"And then when you pull it, there was a quick second of pain. And then there's a satisfaction and then immediate regret.

"So there was a paparazzi shot of he and I, and it was the first time I was in the tabloids.

The former Newsroom star - who is now married to John Mulaney and has Malcolm, three, as well as nine-month-old Mei with him - was shocked at the time because friends thought she had set the whole thing up herself.

"They found this blue old prom dress with big pom poms on the side. And I was like, 'Oh, wonder if I can make it into the worst best dressed list?

"There were paparazzi outside his house because he had been in Star Trek and all this. And they caught photos of me. I was like, 'Oh my god.' And when it got out, one of my friends was like, 'Hey, you're dating Chris Pine.'

"And they were like, 'I think she set this up. Who's carrying a clutch during the day?'

"That began my trichotillomania."

Olivia - who dated Chris for a matter of months from 2009 until 2010 - confirmed that she is still in touch with the Hollywood star, and had a "great" time with him when they caught up with one another recently.

She said: "He is amazing. We were recently at the SNL 50, and we're in the airport lounge together, and it was so great to catch up. He's just the best."