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Kate Beckinsale has revealed her weight loss is down to the 'stress and grief' of the death of her stepfather and her mother's cancer diagnosis as she hit back at trolls.

The British actress, 51, slammed some of her 'a**hole' followers, who told her she needed to put on weight in the comments section of her latest Instagram post.

After sharing a video clip in a crop top and bikini bottoms, one follower queried where her 'a**' had gone and encouraged Kate to 'do some squats'.

Another claimed her body had 'shrank' while another insisted that she 'seemed upset' in the video posted on Monday evening. 

However, Kate fired back at the cruel comments ands explained that there were several reasons for her changed figure, including a six-week hospital stint.

Kate, who recently revealed her weight loss is down to 'stress and grief', caused concern on social media over several unexplained health scares over the last year

Kate Beckinsale has revealed her weight loss is down to the 'stress and grief' of the death of her stepfather and her mother's cancer diagnosis as she hit back at trolls

She captioned a video: 'Let's have a toast for the douche bags. Let's have a toast for the a**holes. Let's have a toast for the scumbags'

She captioned the video: 'Let's have a toast for the douche bags. Let's have a toast for the a**holes. Let's have a toast for the scumbags'

Kate's stepdad Roy Battersby died in January following a 'brief illness' after being diagnosed with two forms of cancer the summer before (pictured left with her mother Judy right)

Kate's stepdad Roy Battersby died in January following a 'brief illness' after being diagnosed with two forms of cancer the summer before (pictured left with her mother Judy right)

She replied: 'No, actually, I watched my stepfather die quite shockingly, my mother has stage 4 cancer and I lost a lot of eight from stress and grief...

'Quite quickly and then I was in hospital for six weeks because the grief had burned a hole in my oesophagus, which made me vomit copious amounts of blood, and I found eating very hard...

'And I just worked very very hard on a movie that was actually quite triggering because it also involved the theme of the death of my father so I'm not really concerned about what you think about my a**. Maybe you should worry about your own f***ing a**. I suggest shoving something up it, like a large pineapple or a brick.'

Kate's stepdad Roy Battersby died in January after suffering 'a massive stroke' while battling two forms of cancer, which he was diagnosed with the summer before.

Shortly after his death, Kate also revealed that her mother Judy Loe had also been told she has stage four cancer.

Another person asked: 'How's your health Katie? You look like you have lost some weight?', to which she responded: 'It's great now thanks'.

One other replied underneath: 'I posted basically the same thing, she looks unhealthy' and another person said: 'Someone seems upset'.

Kate quipped: 'I don't think you look upset. I think you look like maybe your rictus grim is concealing years of bitterness but I wouldn't call it upset necessarily.'

After sharing a video clip in a crop top and bikini bottoms, one follower queried where her 'a**' had gone and encouraged Kate to 'do some squats'

After sharing a video clip in a crop top and bikini bottoms, one follower queried where her 'a**' had gone and encouraged Kate to 'do some squats'

Kate fired back at the cruel comments ands explained that there were several reasons for her changed figure, including a six-week hospital stint

Kate fired back at the cruel comments ands explained that there were several reasons for her changed figure, including a six-week hospital stint

Another person asked: 'How's your health Katie? You look like you have lost some weight?', to which she responded: 'It's great now thanks'

Another person asked: 'How's your health Katie? You look like you have lost some weight?', to which she responded: 'It's great now thanks'

One other replied underneath: 'I posted basically the same thing, she looks unhealthy' and another person said: 'Someone seems upset'

One other replied underneath: 'I posted basically the same thing, she looks unhealthy' and another person said: 'Someone seems upset'

In several posts, Nicole claimed that she knew the people behind some of the comments, who she said were hiding behind fake profiles.

In response to someone who asked 'Kate, you're getting everyone so rattled are they ok?', 'Are they okay hun? Are they okay? Actually? I know who quite a few of them are and they are really not okay.'

Replying to a person who had said 'so weird how the head keeps growing but the body shrinks. They turn into gnomes', Kate said: 'the LOL of your bio picture being an actual gnome living its best life in the forest has given me so much life. I can't tell you please go gather some more nuts and berries.'

As well as replying to some of the negative comments, Kate also took the time to reply to some of her fans who had wished her well.

One said: 'You have more true fans who appreciate you than haters. Always know this [smiley face emoji]'.

Kate replied: 'Oh I love my followers I really do - some of them are such incredible decent, supportive brilliant souls of me and of each other.

'I actually have a problem with two people who keep making multiple accounts so don't be fooled. A lot of this is them.'

Kate's original post was of her joking about people who said she hasn't been acting her age on social media.

The model playfully put a hairnet over her head and joked that she needed to take up knitting in order to be more 'age appropriate' for her fanbase.

She captioned the video: 'Let's have a toast for the douche bags. Let's have a toast for the a**holes. Let's have a toast for the scumbags.'

As well as replying to some of the negative comments, Kate also took the time to reply to some of her fans who had wished her well

As well as replying to some of the negative comments, Kate also took the time to reply to some of her fans who had wished her well

In March Kate revealed she had been hospitalised after sparking concern among her fans with tearful selfies.

She later explained the reason behind her hospital stint in a now-deleted Instagram post, writing: 'I spent six weeks in hospital due to copiously vomiting blood from a Mallory Weiss tear caused by the stress of a whole year ripping a hole between my oesophagus [sic] and stomach.'

'That's what I am prepared to disclose that has contributed to some weight loss. What you think of my appearance and how I should look, independently of any circumstances in my life and my family's is not important.'

In recent months, Kate had been caring for her mother and late stepmother after flying them out from the UK to stay with her in Los Angeles.

'Kate has been caring for her parents, who both have serious illnesses, for most of the year,' a source exclusively revealed to DailyMail.com late last year. 'She brought them to her home in LA and has made looking after them her number one priority.'

Kate revealed she's still in hospital and did not disclose why she had been hospitalised

Kate revealed she's still in hospital and did not disclose why she had been hospitalised

Last month, Kate shared a picture of Roy's order of service that revealed he was cremated on Monday February 19 at Mortlake Crematorium near Kew in west London

Last month, Kate shared a picture of Roy's order of service that revealed he was cremated on Monday February 19 at Mortlake Crematorium near Kew in west London 

On January 10, Kate announced the death of stepfather Roy aged 87.

The insider revealed that the Snow Angels star — whose biological father Richard Beckinsale died in 1979 at 31 from a heart attack in his sleep — has been feeling the emotional toll in recent months.

'She was spotted this week several times crying in the corridors of UCLA hospital,' the source added. 'Her friends are very concerned that she has been under relentless strain for months and hardly sleeping or eating.

'Kate appears to be very strong but this has been incredibly hard and, given that she lost her father so young, is affecting her very deeply. Her friends are concerned for her own health.'

A second source explained that her mother Judy has chosen to keep her health battle private, stating: 'She's extraordinary, you wouldn't even know by looking at her. She has been keeping a very positive attitude throughout everything.'

Kate shared a picture of Roy's order of service that revealed he was cremated on Monday February 19 at Mortlake Crematorium near Kew in west London.

She also shared another look at the document which had a sweet message on, along with more snaps of Roy.

It read: 'We wish to thank you, our family and friends, for your loving support and being with us today to honour and commemorate Roy.

'Please join us afterwards to celebrate him and his life, share memories and stories, and inevitably miss him, knowing how much he would enjoy such a get-together'.

Kate's actress mother Judy married Roy in 1997, 18 years after Kate's father, Porridge star Richard Beckinsale, died (pictured in 1986)

Kate's actress mother Judy married Roy in 1997, 18 years after Kate's father, Porridge star Richard Beckinsale, died (pictured in 1986) 

Kate's mother Judy married Roy 18 years after Kate's father, Porridge star Richard Beckinsale, died.

Roy enjoyed his own successful career as a director, working on major British on-screen hits including Inspector Morse and Cracker. His most recent directorial credit was for a 2006 episode of A Touch Of Frost.

Kate's biological father Richard Beckinsale was best known for his roles as Lennie Godber in the BBC sitcom Porridge and Alan Moore in the ITV sitcom Rising Damp.

He also had a daughter — Samantha, 55 — who is his only child from his marriage to Margaret Bradley.