Hilary Duff's neighbour is threatening to sue her after she called him out on social media for allegedly making her apartment ''reek'' of cigarettes and marijuana.

The 30-year-old actress took to her Instagram story recently to slam another resident of the New York apartment building where she lives for allegedly smoking ''weed all night long'' and for making so much noise that she barely gets any sleep anymore.

However, Dieter Addison - the neighbour accused of such behaviour - has decided to seek help from a lawyer because he claims he doesn't use marijuana, he lives in the apartment full-time with a sober companion and he's now receiving hate mail.

Speaking to the New York Post newspaper's Page Six column, he said: ''I've been sober for months now. I smoke a ton of cigarettes, don't get me wrong, but this is a smoking building, which is why I signed the lease here. I am getting a lot of hate mail and threats from her fans, it is so bad I'm going to have to get a bodyguard. I am from a very private German family and we are hiring lawyers.''

Hilary took to her Instagram account earlier this week to seek advice on the matter.

She said in a video: ''Calling all New Yorkers with a**hole neighbours - really open to any advice you have. My neighbour smokes cigarettes and weed all night long. My apartment reeks. Seriously, what do I do?

''We know your parents pay your rent. We know you've never worked a day in your life - must be nice. Have some respect for your neighbours who work hard to live in that building. Don't be a d**k, dude - and put your trash down the shoot.''

In a second post, she wrote: ''Slept 0 minutes last night because of dieter the [eggplant emoji]. Worked 15 hours yesterday and back at work again at 5:30 am. This is the real world dieter the [eggplant emoji]. Your smoking ain't delicious. (sic)''

Hilary then called out Dieter for having arguments with his partner, which leave her six-year-old son Luca - whom she has with her ex-husband MIKE COMRIE - terrified.

She added: ''And another thing ... stop breaking all your furniture when you fight with your girlfriend or boyfriend ... it scares me and my kid. Therapy is cheaper ... (sic)''

Hilary's annoyance at her lazy neighbour comes after she revealed she finds it hard to balance her hectic work life with her personal one, and only recently discovered the importance of taking time out of her schedule for herself.

She said: ''I started to feel less guilt about taking time for myself, or you know, maybe not putting Luca to bed one night and going out with my girlfriends and having a fun dinner. That stuff rejuvenates you, and I matter too.''