They say you can’t keep a good woman down, and -- most likely because her antidepressants are really working -- Demi Moore is making that platitude the story of her social life after her trip to Miami last week.

All this despite reports indicating she's been sent packing by her latest much-younger conquest. Because she's too childish for even guys half her age now.

It was just a couple of weeks ago when we found out Ms. Moore, 50, earned another badge for her Extreme Age Difference sash when she took up with 26-year-old art dealer Vito Schnabel.

But when she arrived in Miami to join him for the Art Basel art fair last week -- and also party her pants off with any celeb she could find who was willing to help keep her standing -- Vito had had enough. Seems he went to Art Basel to network and focus on his career, while she went to wear sunglasses and have her photo taken with as many different drinks and people as possible.

In short: Demi wasn't mature enough for Vito.

Welcome to Opposite World, where the cougars are now too young for their prey.

“Vito wasn’t too happy that Demi flew down to party while he was working to build his business," a source told Page Six. "It was a distraction he didn’t need while all the big collectors were in town ... Vito has worked very hard to be taken seriously in the art business, and doesn’t want to be seen as somebody who dates celebrities.”

Moore took the split in stride, though. She stayed in Miami to party anyway, during which she danced for a bemused Lenny Kravitz and made friends with a kitten.

As you do.

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