Heidi Klum [Photo/Agencies]

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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 behaviour.

A source told : "Heidi's drinking and outspoken rude behaviour 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."

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.

The source explained: "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."

Meanwhile, Heidi, who was previously married to Ric Pipino before marrying Seal in 2005, is already considering introducing Vito to her children.

A source said previously: "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."