To put it mildly, Courteney Cox has endured her share of surprises and drama with estranged husband David Arquette.

Cox, 46, continued to speak super-frankly about their talked-about relationship during a Tuesday appearance on Jimmy Kimmel Live — dishing on a recent discovery that had her wondering whether Arquette might be harboring a secret.

As she was buying new songs on iTunes, the Scream 4 actress was perusing the purchase history of the iTunes account she and Arquette, 39, share.

She noticed someone had downloaded a slew of self-help books by author Eckhart Tolle — plus the iPhone app Grindr.

Employing GPS technology, Grindr is a popular application used by gay men to meet (and often hook up with) other local guys. Cox was taken aback, she told Jimmy Kimmel. "Wow, what if you don't know the person you've been with for that long? [I wondered] if David's been buying Grindr!"

"I called up my assistant, who happens to be gay," Cox continued, explaining that she was "shaking" as she asked if he had downloaded Grindr himself through their account.

Indeed, the assistant had, in fact, downloaded the app (for free) on the acccount.

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Although Cox was game to chat about her husband of 11 years and dad to Coco, her 6-year-old daughter, Arquette recently told Us Weekly he's "sick" of talking about their marital struggles.

"All of this started because there are lies out there a lot of the time, and I wanted to be honest and speak my mind," said the star, who's recovering since exiting rehab in January.

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