Topless And Senseless? Heidi Klum Parties Up A Storm With Boytoy Vito Schnabel As Friends Fear 'Midlife Crisis' And Say 'She's Impossible To Deal With'

It even happens to supermodels!

A bad midlife crisis has apparently hit Heidi Klum so hard that the 40-year-old America's Got Talent judge is partying a storm and going topless in public displays of affection with her boytoy lover Vito Schnabel, 27, RadarOnline.com has learned

"Heidi's drinking and outspoken rude behavior is winning her no friends these days," a source sighed to Radar.

"She's going through a bad midlife crisis that makes her almost impossible to deal with. Heidi spent most of last year partying and she needs to shape up or face consequences."

According to the insider, Klum's bad girl ways were the  key to her split from her bodyguard-turned-lover Martin Kristen this January after an 18-month romance.

The German stunner wasted no time in hooking up with Demi Moore's ex-boyfriend, playboy art dealer Schnabel, as the pair were spotted making out at Bootsy Bellows bar in February.

And just recently, Klum, who split from Seal, 51,   in 2012, doffed her top on a Mexico beach and engaged in public displays of affection with Schnabel.

Meanwhile, her four kids are not getting much time with mommy, the source revealed.

"Since Vito came on the scene, her kids have spent a lot more time with their nannies!

"More trouble is most certainly ahead for Heidi in 2014 as she is not nearly the hot in-demand star she was six years ago and it's really hit her hard," the source said of the Project Runway star.

"She's beginning to miss the respect and admiration she used to have as Mrs. Seal."