Heidi Klum is reportedly going through a "mid-life crisis."

The 40-year-old model is reportedly losing some of her close friends as they're struggling to deal with her new-found love of partying and wild behavior. "Heidi's drinking and outspoken rude behavior is winning her no friends these days. 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," a source said.

Her friends are reportedly worried that she's not spending enough time with her children, Leni, nine, Henry, eight, Johan, seven, and Lou, four, because she's too busy with her new toyboy boyfriend Vito Schnabel, 27, whom she began dating in February, and trying to boost her career. "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 explained.

Meanwhile, Heidi, who was previously married to Ric Pipino before marrying Seal in 2005, is already considering introducing Vito to her children. "Heidi's preparing to introduce him to her children. That's a strong indication she's in this for the long run. Vito has brought some excitement to her life. He has moved in pretty quickly and seems to be providing exactly what Heidi needs at this time. She's so happy that it wouldn't surprise me if Heidi shocked the world and made him husband number three," a source previously said.